Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / System / data / design / CodeGenHelper.cs / 6 / CodeGenHelper.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All Rights Reserved.
// Information Contained Herein is Proprietary and Confidential.
//
//-----------------------------------------------------------------------------
namespace System.Data.Design {
using System;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Collections;
using System.Data;
using System.Data.SqlTypes;
using System.Design;
using System.Diagnostics;
using System.IO;
using System.Reflection;
internal sealed class CodeGenHelper {
///
/// Private contstructor to avoid class being instantiated.
///
private CodeGenHelper() {
}
// CodeGen Helper functions :
// -------------------- Expressions: ----------------------------
//\\ this
internal static CodeExpression This() { return new CodeThisReferenceExpression();}
//\\ base
internal static CodeExpression Base() { return new CodeBaseReferenceExpression();}
//\\ value
internal static CodeExpression Value() { return new CodePropertySetValueReferenceExpression();}
//\\
internal static CodeTypeReference Type(string type) { return new CodeTypeReference(type); }
internal static CodeTypeReference Type(Type type) { return new CodeTypeReference(type); }
internal static CodeTypeReference NullableType(Type type) {
CodeTypeReference ctr = new CodeTypeReference(typeof(System.Nullable));
ctr.Options = CodeTypeReferenceOptions.GlobalReference;
ctr.TypeArguments.Add(CodeGenHelper.GlobalType(type));
return ctr;
}
//\\ []
//internal static CodeTypeReference Type(Type type, Int32 rank) { return new CodeTypeReference(type.ToString(), rank); }
internal static CodeTypeReference Type(string type, Int32 rank) { return new CodeTypeReference(type, rank); }
internal static CodeTypeReference GlobalType(Type type) { return new CodeTypeReference(type.ToString(), CodeTypeReferenceOptions.GlobalReference); }
internal static CodeTypeReference GlobalType(Type type, Int32 rank) { return new CodeTypeReference(CodeGenHelper.GlobalType(type), rank); }
internal static CodeTypeReference GlobalType(string type) { return new CodeTypeReference(type, CodeTypeReferenceOptions.GlobalReference); }
//\\
internal static CodeTypeReferenceExpression TypeExpr(CodeTypeReference type) { return new CodeTypeReferenceExpression(type); }
internal static CodeTypeReferenceExpression GlobalTypeExpr(Type type) { return new CodeTypeReferenceExpression(GlobalType(type)); }
internal static CodeTypeReferenceExpression GlobalTypeExpr(string type) { return new CodeTypeReferenceExpression(GlobalType(type)); }
//\\ GlobalGenericType
internal static CodeTypeReference GlobalGenericType(string fullTypeName, Type itemType) {
return GlobalGenericType(fullTypeName, CodeGenHelper.GlobalType(itemType));
}
internal static CodeTypeReference GlobalGenericType(string fullTypeName, CodeTypeReference itemType) {
CodeTypeReference genericTypeRef = new CodeTypeReference(fullTypeName, itemType);
genericTypeRef.Options = CodeTypeReferenceOptions.GlobalReference;
return genericTypeRef;
}
//\\ (())
internal static CodeExpression Cast(CodeTypeReference type, CodeExpression expr) { return new CodeCastExpression(type, expr); }
//\\ typeof()
internal static CodeExpression TypeOf(CodeTypeReference type) { return new CodeTypeOfExpression(type); }
//\\ .field
internal static CodeExpression Field(CodeExpression exp, string field) { return new CodeFieldReferenceExpression(exp, field);}
//\\ this.field
internal static CodeExpression ThisField(string field) { return new CodeFieldReferenceExpression(This(), field); }
//\\ .property
internal static CodeExpression Property(CodeExpression exp, string property) { return new CodePropertyReferenceExpression(exp, property);}
//\\ this.property
internal static CodeExpression ThisProperty(string property) { return new CodePropertyReferenceExpression(This(), property); }
//\\ argument
internal static CodeExpression Argument(string argument) { return new CodeArgumentReferenceExpression(argument);}
//\\ variable
internal static CodeExpression Variable(string variable) { return new CodeVariableReferenceExpression(variable);}
//\\ this.eventName
internal static CodeExpression Event(string eventName) { return new CodeEventReferenceExpression(This(), eventName);}
//\\ new ()
internal static CodeExpression New(CodeTypeReference type, CodeExpression[] parameters) { return new CodeObjectCreateExpression(type, parameters);}
//\\ new []
internal static CodeExpression NewArray(CodeTypeReference type, int size) { return new CodeArrayCreateExpression(type, size); }
//\\ new {, , ...}
internal static CodeExpression NewArray(CodeTypeReference type, params CodeExpression[] initializers) { return new CodeArrayCreateExpression(type, initializers); }
//\\
internal static CodeExpression Primitive(object primitive) { return new CodePrimitiveExpression(primitive);}
//\\ ""
internal static CodeExpression Str(string str) { return Primitive(str);}
//\\ .()
internal static CodeExpression MethodCall(CodeExpression targetObject, String methodName, CodeExpression[] parameters) {
return new CodeMethodInvokeExpression(targetObject, methodName, parameters);
}
//\\ .()
internal static CodeStatement MethodCallStm(CodeExpression targetObject, String methodName, CodeExpression[] parameters) {
return Stm(MethodCall(targetObject, methodName, parameters));
}
//\\ .()
internal static CodeExpression MethodCall(CodeExpression targetObject, String methodName) {
return new CodeMethodInvokeExpression(targetObject, methodName);
}
//\\ .()
internal static CodeStatement MethodCallStm(CodeExpression targetObject, String methodName) {
return Stm(MethodCall(targetObject, methodName));
}
//\\ .(par)
internal static CodeExpression MethodCall(CodeExpression targetObject, String methodName, CodeExpression par) {
return new CodeMethodInvokeExpression(targetObject, methodName, new CodeExpression[] {par});
}
//\\ .(par)
internal static CodeStatement MethodCallStm(CodeExpression targetObject, String methodName, CodeExpression par) {
return Stm(MethodCall(targetObject, methodName, par));
}
//\\ (par)
internal static CodeExpression DelegateCall(CodeExpression targetObject, CodeExpression par) {
return new CodeDelegateInvokeExpression(targetObject, new CodeExpression[] {This(), par});
}
//\\ [indices]()
internal static CodeExpression Indexer(CodeExpression targetObject, CodeExpression indices) {return new CodeIndexerExpression(targetObject, indices);}
//\\ [indices]()
internal static CodeExpression ArrayIndexer(CodeExpression targetObject, CodeExpression indices) { return new CodeArrayIndexerExpression(targetObject, indices); }
//\\ ReferenceEquals
internal static CodeExpression ReferenceEquals(CodeExpression left, CodeExpression right) {
return CodeGenHelper.MethodCall(
CodeGenHelper.GlobalTypeExpr(typeof(object)),
"ReferenceEquals",
new CodeExpression[] { left, right }
);
}
//\\ ReferenceNotEquals
internal static CodeExpression ReferenceNotEquals(CodeExpression left, CodeExpression right) {
return CodeGenHelper.EQ(ReferenceEquals(left, right), Primitive(false));
}
// -------------------- Binary Operators: ----------------------------
internal static CodeBinaryOperatorExpression BinOperator(CodeExpression left, CodeBinaryOperatorType op, CodeExpression right) {
return new CodeBinaryOperatorExpression(left, op, right);
}
//\\ (left) != (right)
internal static CodeBinaryOperatorExpression IdNotEQ(CodeExpression left, CodeExpression right) {return BinOperator(left, CodeBinaryOperatorType.IdentityInequality, right);}
//\\ (left) != (right)
internal static CodeBinaryOperatorExpression IdEQ(CodeExpression left, CodeExpression right) {return BinOperator(left, CodeBinaryOperatorType.IdentityEquality, right);}
//\\ (left) is null
internal static CodeBinaryOperatorExpression IdIsNull(CodeExpression id) { return IdEQ(id, Primitive(null)); }
//\\ (left) isnot null
internal static CodeBinaryOperatorExpression IdIsNotNull(CodeExpression id) { return IdNotEQ(id, Primitive(null)); }
//\\ (left) == (right)
internal static CodeBinaryOperatorExpression EQ(CodeExpression left, CodeExpression right) {return BinOperator(left, CodeBinaryOperatorType.ValueEquality, right);}
//\\ (left) != (right)
internal static CodeBinaryOperatorExpression NotEQ(CodeExpression left, CodeExpression right) { return EQ(EQ(left, right), Primitive(false)); }
//\\ (left) && (right)
internal static CodeBinaryOperatorExpression BitwiseAnd(CodeExpression left, CodeExpression right) {return BinOperator(left, CodeBinaryOperatorType.BitwiseAnd, right);}
//\\ (left) && (right)
internal static CodeBinaryOperatorExpression And(CodeExpression left, CodeExpression right) { return BinOperator(left, CodeBinaryOperatorType.BooleanAnd, right); }
//\\ (left) || (right)
internal static CodeBinaryOperatorExpression Or(CodeExpression left, CodeExpression right) { return BinOperator(left, CodeBinaryOperatorType.BooleanOr, right); }
//\\ (left) < (right)
internal static CodeBinaryOperatorExpression Less(CodeExpression left, CodeExpression right) {return BinOperator(left, CodeBinaryOperatorType.LessThan , right);}
// -------------------- Statments: ----------------------------
//\\ ;
internal static CodeStatement Stm(CodeExpression expr) { return new CodeExpressionStatement(expr);}
//\\ return();
internal static CodeStatement Return(CodeExpression expr) { return new CodeMethodReturnStatement(expr);}
//\\ return;
internal static CodeStatement Return() { return new CodeMethodReturnStatement(); }
//\\ left = right;
internal static CodeStatement Assign(CodeExpression left, CodeExpression right) { return new CodeAssignStatement(left, right);}
//\\ throw new ()
internal static CodeStatement Throw(CodeTypeReference exception, string arg) {
return new CodeThrowExceptionStatement(New(exception, new CodeExpression[] {Str(arg)}));
}
//\\ throw new (, )
internal static CodeStatement Throw(CodeTypeReference exception, string arg, string inner) {
return new CodeThrowExceptionStatement(New(exception, new CodeExpression[] {Str(arg), Variable(inner)}));
}
//\\ throw new (, inner)
internal static CodeStatement Throw(CodeTypeReference exception, string arg, CodeExpression inner) {
return new CodeThrowExceptionStatement(New(exception, new CodeExpression[] {Str(arg), inner}));
}
// ------------Comments --------------------------------
internal static CodeCommentStatement Comment(string comment, bool docSummary) {
if (docSummary) {
return new CodeCommentStatement("\r\n" + comment + "\r\n ", docSummary);
}
return new CodeCommentStatement(comment);
}
// -------------------- If: ----------------------------
internal static CodeStatement If(CodeExpression cond, CodeStatement[] trueStms, CodeStatement[] falseStms) {
return new CodeConditionStatement(cond, trueStms, falseStms);
}
internal static CodeStatement If(CodeExpression cond, CodeStatement trueStm, CodeStatement falseStm) {
return new CodeConditionStatement(cond, new CodeStatement[] {trueStm}, new CodeStatement[] {falseStm});
}
internal static CodeStatement If(CodeExpression cond, CodeStatement[] trueStms ) {return new CodeConditionStatement(cond, trueStms);}
internal static CodeStatement If(CodeExpression cond, CodeStatement trueStm ) {return If( cond, new CodeStatement[] {trueStm });}
// -------------------- Declarations: ----------------------------
internal static CodeMemberField FieldDecl(CodeTypeReference type, String name) { return new CodeMemberField(type, name); }
internal static CodeMemberField FieldDecl(CodeTypeReference type, String name, CodeExpression initExpr) {
CodeMemberField field = new CodeMemberField(type, name);
field.InitExpression = initExpr;
return field;
}
internal static CodeTypeDeclaration Class(string name, bool isPartial, TypeAttributes typeAttributes) {
CodeTypeDeclaration typeDeclaration = new CodeTypeDeclaration(name);
typeDeclaration.IsPartial = isPartial;
typeDeclaration.TypeAttributes = typeAttributes;
CodeAttributeDeclaration generatedCodeAttribute = new CodeAttributeDeclaration(
CodeGenHelper.GlobalType(typeof(System.CodeDom.Compiler.GeneratedCodeAttribute)),
new CodeAttributeArgument(Str(typeof(System.Data.Design.TypedDataSetGenerator).FullName)),
new CodeAttributeArgument(Str(ThisAssembly.Version)));
typeDeclaration.CustomAttributes.Add(generatedCodeAttribute);
return typeDeclaration;
}
internal static CodeConstructor Constructor(MemberAttributes attributes) {
CodeConstructor constructor = new CodeConstructor();
constructor.Attributes = attributes;
constructor.CustomAttributes.Add(AttributeDecl(typeof(System.Diagnostics.DebuggerNonUserCodeAttribute).FullName));
return constructor;
}
internal static CodeMemberMethod MethodDecl(CodeTypeReference type, String name, MemberAttributes attributes) {
CodeMemberMethod method = new CodeMemberMethod();
method.ReturnType = type;
method.Name = name;
method.Attributes = attributes;
method.CustomAttributes.Add(AttributeDecl(typeof(System.Diagnostics.DebuggerNonUserCodeAttribute).FullName));
return method;
}
internal static CodeMemberProperty PropertyDecl(CodeTypeReference type, String name, MemberAttributes attributes) {
CodeMemberProperty property = new CodeMemberProperty();
property.Type = type;
property.Name = name;
property.Attributes = attributes;
property.CustomAttributes.Add(AttributeDecl(typeof(System.Diagnostics.DebuggerNonUserCodeAttribute).FullName));
return property;
}
internal static CodeStatement VariableDecl(CodeTypeReference type, String name) { return new CodeVariableDeclarationStatement(type, name); }
internal static CodeStatement VariableDecl(CodeTypeReference type, String name, CodeExpression initExpr) { return new CodeVariableDeclarationStatement(type, name, initExpr); }
internal static CodeStatement ForLoop(CodeStatement initStmt, CodeExpression testExpression, CodeStatement incrementStmt, CodeStatement[] statements) {
return new CodeIterationStatement(
initStmt,
testExpression,
incrementStmt,
statements
);
}
internal static CodeMemberEvent EventDecl(string type, String name) {
CodeMemberEvent anEvent = new CodeMemberEvent();
anEvent.Name = name;
anEvent.Type = Type(type);
anEvent.Attributes = MemberAttributes.Public | MemberAttributes.Final;
return anEvent;
}
internal static CodeParameterDeclarationExpression ParameterDecl(CodeTypeReference type, string name) { return new CodeParameterDeclarationExpression(type, name); }
internal static CodeAttributeDeclaration AttributeDecl(string name) {
return new CodeAttributeDeclaration(GlobalType(name));
}
internal static CodeAttributeDeclaration AttributeDecl(string name, CodeExpression value) {
return new CodeAttributeDeclaration(GlobalType(name), new CodeAttributeArgument[] { new CodeAttributeArgument(value) });
}
internal static CodeAttributeDeclaration AttributeDecl(string name, CodeExpression value1, CodeExpression value2) {
return new CodeAttributeDeclaration(GlobalType(name), new CodeAttributeArgument[] { new CodeAttributeArgument(value1), new CodeAttributeArgument(value2)});
}
// -------------------- Try/Catch ---------------------------
//\\ try {}
internal static CodeStatement Try(CodeStatement tryStmnt, CodeCatchClause catchClause) {
return new CodeTryCatchFinallyStatement(
new CodeStatement[] {tryStmnt},
new CodeCatchClause[] {catchClause}
);
}
//\\ try {;;...} ; ; ... Finally {;;...}
internal static CodeStatement Try(CodeStatement[] tryStmnts, CodeCatchClause[] catchClauses, CodeStatement[] finallyStmnts) {
return new CodeTryCatchFinallyStatement(
tryStmnts,
catchClauses,
finallyStmnts
);
}
//\\ catch( ) {}
internal static CodeCatchClause Catch(CodeTypeReference type, string name, CodeStatement catchStmnt) {
CodeCatchClause ccc = new CodeCatchClause();
ccc.CatchExceptionType = type;
ccc.LocalName = name;
if (catchStmnt != null) {
ccc.Statements.Add(catchStmnt);
}
return ccc;
}
internal static FieldDirection ParameterDirectionToFieldDirection(ParameterDirection paramDirection) {
FieldDirection fieldDir = FieldDirection.In;
switch (paramDirection) {
case(ParameterDirection.Output) :
fieldDir = FieldDirection.Out;
break;
case(ParameterDirection.Input) :
fieldDir = FieldDirection.In;
break;
case(ParameterDirection.InputOutput) :
fieldDir = FieldDirection.Ref;
break;
case(ParameterDirection.ReturnValue) :
throw new InternalException("Can't map from ParameterDirection.ReturnValue to FieldDirection.");
default:
throw new InternalException("Unknown ParameterDirection.");
}
return fieldDir;
}
internal static CodeExpression GenerateDbNullCheck(CodeExpression returnParam) {
return CodeGenHelper.Or(
CodeGenHelper.IdEQ(
returnParam,
CodeGenHelper.Primitive(null)
),
CodeGenHelper.IdEQ(
CodeGenHelper.MethodCall(
returnParam,
"GetType"
),
CodeGenHelper.TypeOf(CodeGenHelper.GlobalType(typeof(System.DBNull)))
)
);
}
internal static CodeExpression GenerateNullExpression(Type returnType) {
if(IsSqlType(returnType)) {
return CodeGenHelper.Field(CodeGenHelper.GlobalTypeExpr(returnType), "Null");
}
else {
//
if(returnType == typeof(object)) {
return CodeGenHelper.Field(CodeGenHelper.GlobalTypeExpr(typeof(System.DBNull)), "Value");
}
else if (!returnType.IsValueType){
return CodeGenHelper.Primitive(null);
}
else {
return null;
}
}
}
internal static CodeExpression GenerateConvertExpression(CodeExpression sourceExpression, Type sourceType, Type targetType) {
if (sourceType == targetType) {
return sourceExpression;
}
if (IsSqlType(sourceType)) {
if (IsSqlType(targetType)) {
throw new InternalException("Cannot perform the conversion between 2 SqlTypes.");
}
else {
// Source is SqlType but not target.
PropertyInfo valuePropertyInfo = sourceType.GetProperty("Value");
if (valuePropertyInfo == null) throw new InternalException("Type does not expose a 'Value' property.");
Type equivalentUrtType = valuePropertyInfo.PropertyType;
CodeExpression valueExpression = new CodePropertyReferenceExpression(sourceExpression, "Value");
return GenerateUrtConvertExpression(valueExpression, equivalentUrtType, targetType);
}
}
else {
if (IsSqlType(targetType)) {
// Source is NOT SqlType but target is.
PropertyInfo valuePropertyInfo = targetType.GetProperty("Value");
Type equivalentUrtType = valuePropertyInfo.PropertyType;
CodeExpression urtConvertExpression = GenerateUrtConvertExpression(sourceExpression, sourceType, equivalentUrtType);
return new CodeObjectCreateExpression(targetType, urtConvertExpression);
}
else {
// Neither Source Nor Target are SqlType.
return GenerateUrtConvertExpression(sourceExpression, sourceType, targetType);
}
}
}
internal static string GetTypeName(System.CodeDom.Compiler.CodeDomProvider codeProvider, string string1, string string2) {
string activatorTypeName = codeProvider.GetTypeOutput(CodeGenHelper.Type(typeof(System.Activator)));
string typeSeparator = activatorTypeName.Replace("System", "").Replace("Activator", "");
return string1 + typeSeparator + string2;
}
internal static bool SupportsMultipleNamespaces(System.CodeDom.Compiler.CodeDomProvider codeProvider) {
string ns1Name = MemberNameValidator.GenerateIdName("TestNs1", codeProvider, false /*useSuffix*/);
string ns2Name = MemberNameValidator.GenerateIdName("TestNs2", codeProvider, false /*useSuffix*/);
CodeNamespace ns1 = new CodeNamespace(ns1Name);
CodeNamespace ns2 = new CodeNamespace(ns2Name);
CodeCompileUnit compileUnit = new CodeCompileUnit();
compileUnit.Namespaces.Add(ns1);
compileUnit.Namespaces.Add(ns2);
StringWriter writer = new StringWriter(System.Globalization.CultureInfo.CurrentCulture);
codeProvider.GenerateCodeFromCompileUnit(compileUnit, writer, new CodeGeneratorOptions());
string generatedCode = writer.GetStringBuilder().ToString();
return (generatedCode.Contains(ns1Name) && generatedCode.Contains(ns2Name));
}
internal static DSGeneratorProblem GenerateValueExprAndFieldInit(DesignColumn designColumn,
object valueObj,
object value,
string className,
string fieldName,
out CodeExpression valueExpr,
out CodeExpression fieldInit)
{
DataColumn column = designColumn.DataColumn;
valueExpr = null;
fieldInit = null;
if(
column.DataType == typeof(char) || column.DataType == typeof(string) ||
column.DataType == typeof(decimal)|| column.DataType == typeof(bool) ||
column.DataType == typeof(Single) || column.DataType == typeof(double) ||
column.DataType == typeof(SByte) || column.DataType == typeof(Byte) ||
column.DataType == typeof(Int16) || column.DataType == typeof(UInt16) ||
column.DataType == typeof(Int32) || column.DataType == typeof(UInt32) ||
column.DataType == typeof(Int64) || column.DataType == typeof(UInt64)
) { // types can be presented by literal. Really this is language dependent :-(
valueExpr = CodeGenHelper.Primitive(valueObj);
}
else {
valueExpr = CodeGenHelper.Field(
CodeGenHelper.TypeExpr(CodeGenHelper.Type(className)),
fieldName
);
//\\ private static _nullValue = new ("");
if(column.DataType == typeof(Byte[])) {
fieldInit = CodeGenHelper.MethodCall(
CodeGenHelper.GlobalTypeExpr(typeof(System.Convert)),
"FromBase64String",
CodeGenHelper.Primitive(value)
);
}
else if(column.DataType == typeof(DateTime)) {
fieldInit = CodeGenHelper.MethodCall(
CodeGenHelper.GlobalTypeExpr(column.DataType),
"Parse",
CodeGenHelper.Primitive(((DateTime)valueObj).ToString(System.Globalization.DateTimeFormatInfo.InvariantInfo)));
}
else if(column.DataType == typeof(TimeSpan)) {
fieldInit = CodeGenHelper.MethodCall(
CodeGenHelper.GlobalTypeExpr(column.DataType),
"Parse",
CodeGenHelper.Primitive(valueObj.ToString()));
}else /*object*/ {
/* check that type can be constructed from this string */ {
ConstructorInfo constructor = column.DataType.GetConstructor(new Type[] {typeof(string)});
if(constructor == null) {
return new DSGeneratorProblem(SR.GetString(SR.CG_NoCtor1, column.ColumnName, column.DataType.Name), ProblemSeverity.NonFatalError, designColumn);
}
constructor.Invoke(new Object[] {value}); // can throw here.
}
fieldInit = CodeGenHelper.New(
CodeGenHelper.GlobalType(column.DataType),
new CodeExpression[] {CodeGenHelper.Primitive(value)}
);
}
}
return null;
}
internal static string GetLanguageExtension(CodeDomProvider codeProvider) {
if (codeProvider == null) {
return string.Empty;
}
else {
string extension = "." + codeProvider.FileExtension;
if (extension.StartsWith("..", StringComparison.Ordinal)) {
extension = extension.Substring(1);
}
return extension;
}
}
internal static bool IsGeneratingJSharpCode(CodeDomProvider codeProvider) {
return StringUtil.EqualValue(GetLanguageExtension(codeProvider), ".jsl");
}
//internal static bool IsGeneratingCSharpCode(CodeDomProvider codeProvider) {
// return StringUtil.EqualValue(GetLanguageExtension(codeProvider), ".cs");
//}
private static bool IsSqlType(Type type){
if (type == typeof(SqlBinary) ||
type == typeof(SqlBoolean) ||
type == typeof(SqlByte) ||
type == typeof(SqlDateTime) ||
type == typeof(SqlDecimal) ||
type == typeof(SqlDouble) ||
type == typeof(SqlGuid) ||
type == typeof(SqlInt16) ||
type == typeof(SqlInt32) ||
type == typeof(SqlInt64) ||
type == typeof(SqlMoney) ||
type == typeof(SqlSingle) ||
type == typeof(SqlString)) {
return true;
} else {
return false;
}
}
// GenerateUrtConvertExpression -- Generates appropriate code to do the conversion between 2 URT types.
// e.g. : Convert.ToInt32( intExpression )
private static CodeExpression GenerateUrtConvertExpression(CodeExpression sourceExpression, Type sourceUrtType, Type targetUrtType) {
if (sourceUrtType == targetUrtType) {
return sourceExpression;
}
if (sourceUrtType == typeof(System.Object)) {
// in this case we just generate a cast expression
return CodeGenHelper.Cast(CodeGenHelper.GlobalType(targetUrtType), sourceExpression);
}
// First see if System.Convert can do the conversion directly using the ToXXX methods.
if (ConversionHelper.CanConvert(sourceUrtType, targetUrtType)) {
return new CodeMethodInvokeExpression(CodeGenHelper.GlobalTypeExpr("System.Convert"), ConversionHelper.GetConversionMethodName(sourceUrtType, targetUrtType), sourceExpression);
}
else {
return new CodeCastExpression(CodeGenHelper.GlobalType(targetUrtType), new CodeMethodInvokeExpression(CodeGenHelper.GlobalTypeExpr("System.Convert"), "ChangeType", sourceExpression, CodeGenHelper.TypeOf(CodeGenHelper.GlobalType(targetUrtType))));
}
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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