Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Extensions / UI / WebControls / Expressions / MethodExpression.cs / 1305376 / MethodExpression.cs
#if ORYX_VNEXT namespace Microsoft.Web.Data.UI.WebControls.Expressions { using System.Web; #else namespace System.Web.UI.WebControls.Expressions { #endif using System; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Globalization; using System.Linq; using System.Linq.Expressions; using System.Reflection; using System.Web.Compilation; using System.Web.DynamicData; using System.Web.Resources; using System.Web.UI.WebControls; public class MethodExpression : ParameterDataSourceExpression { private static readonly BindingFlags MethodFlags = BindingFlags.Static | BindingFlags.Public | BindingFlags.Instance | BindingFlags.FlattenHierarchy; // We'll populate a list of ways to get the type private Func[] typeGetters; public string TypeName { get { return (string)ViewState["TypeName"] ?? String.Empty; } set { ViewState["TypeName"] = value; } } public string MethodName { get { return (string)ViewState["MethodName"] ?? String.Empty; } set { ViewState["MethodName"] = value; } } public bool IgnoreIfNotFound { get { object o = ViewState["IgnoreIfNotFound"]; return o != null ? (bool)o : false; } set { ViewState["IgnoreIfNotFound"] = value; } } public MethodExpression() { // 1. If a TypeName is specified find the method on that type. // 2. Otherwise, if the DataSource is an IDynamicDataSource, then use context type and search for the method. // 3. Otherwise look for the method on the current TemplateControl (Page/UserControl) etc. typeGetters = new Func [] { () => GetType(TypeName), () => GetType(DataSource), () => (Owner != null && Owner.TemplateControl != null) ? Owner.TemplateControl.GetType() : null }; } private static Type GetType(string typeName) { if (!String.IsNullOrEmpty(typeName)) { return BuildManager.GetType(typeName, false /* throwOnError */, true /* ignoreCase */); } return null; } private static Type GetType(IQueryableDataSource dataSource) { IDynamicDataSource dynamicDataSource = dataSource as IDynamicDataSource; if (dynamicDataSource != null) { return dynamicDataSource.ContextType; } return null; } internal MethodInfo ResolveMethod() { if (String.IsNullOrEmpty(MethodName)) { throw new InvalidOperationException(AtlasWeb.MethodExpression_MethodNameMustBeSpecified); } MethodInfo methodInfo = null; // We allow the format string {0} in the method name IDynamicDataSource dataSource = DataSource as IDynamicDataSource; if (dataSource != null) { MethodName = String.Format(CultureInfo.CurrentCulture, MethodName, dataSource.EntitySetName); } else if (MethodName.Contains("{0}")) { // If method has a format string but no IDynamicDataSource then throw an exception throw new InvalidOperationException(AtlasWeb.MethodExpression_DataSourceMustBeIDynamicDataSource); } foreach (Func typeGetter in typeGetters) { Type type = typeGetter(); // If the type is null continue to next fall back function if (type == null) { continue; } methodInfo = type.GetMethod(MethodName, MethodFlags); if (methodInfo != null) { break; } } return methodInfo; } public override IQueryable GetQueryable(IQueryable source) { if (source == null) { throw new ArgumentNullException("source"); } MethodInfo method = ResolveMethod(); // Get the parameter values IDictionary parameterValues = GetValues(); if (method == null) { if (IgnoreIfNotFound) { // Unchange the IQueryable if the user set IgnoreIfNotFound return source; } throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.MethodExpression_MethodNotFound, MethodName)); } if(!method.IsStatic) { throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, AtlasWeb.MethodExpression_MethodMustBeStatic, MethodName)); } ParameterInfo[] parameterArray = method.GetParameters(); if (parameterArray.Length == 0 || !parameterArray[0].ParameterType.IsAssignableFrom(source.GetType())) { throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, AtlasWeb.MethodExpression_FirstParamterMustBeCorrectType, MethodName, source.GetType())); } object[] arguments = new object[parameterArray.Length]; // First argument is the IQueryable arguments[0] = source; for (int i = 1; i < parameterArray.Length; ++i) { ParameterInfo param = parameterArray[i]; object value; if (!parameterValues.TryGetValue(param.Name, out value)) { throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, AtlasWeb.MethodExpression_ParameterNotFound, MethodName, param.Name)); } arguments[i] = DataSourceHelper.BuildObjectValue(value, param.ParameterType, param.Name); } object result = method.Invoke(null, arguments); // Require the return type be the same as the parameter type if (result != null) { IQueryable queryable = result as IQueryable; // Check if the user did a projection (changed the T in IQuerable ) if (queryable == null || !queryable.ElementType.IsAssignableFrom(source.ElementType)) { throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, AtlasWeb.MethodExpression_ChangingTheReturnTypeIsNotAllowed, source.ElementType.FullName)); } } return (IQueryable)result; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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