Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataWebControls / System / Data / WebControls / EntityDataSourceMemberPath.cs / 1305376 / EntityDataSourceMemberPath.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.EntityClient; using System.Data.Metadata.Edm; using System.Diagnostics; using System.Globalization; using System.Reflection; using System.Data.Common; using System.Data.Objects; namespace System.Web.UI.WebControls { ////// A glorified linked list. Describes a chain of properties from a primitive /// type to a root entity. /// class EntityDataSourceMemberPath { private readonly EdmProperty property; private readonly PropertyInfo propertyInfo; private readonly EntityDataSourceMemberPath parent; private readonly bool isLocallyInteresting; private readonly Type clrType; private readonly bool isKey; internal EntityDataSourceMemberPath(MetadataWorkspace ocWorkspace, EntityDataSourceMemberPath parent, EdmProperty property, bool isLocallyInteresting) { EntityDataSourceUtil.CheckArgumentNull(ocWorkspace, "ocWorkspace"); EntityDataSourceUtil.CheckArgumentNull(property, "property"); this.property = property; this.parent = parent; this.isLocallyInteresting = isLocallyInteresting; this.clrType = EntityDataSourceUtil.GetMemberClrType(ocWorkspace, property); this.isKey = IsPropertyAKey(property); // retrieve PropertyInfo (with respect to parent CLR type) StructuralType parentType = property.DeclaringType; Type parentClrType = EntityDataSourceUtil.GetClrType(ocWorkspace, parentType); this.propertyInfo = EntityDataSourceUtil.GetPropertyInfo(parentClrType, this.property.Name); } ////// Describes the member path in the form 'property1.property2...'. Use to /// determine display name for nested properties in the EDSC. /// ///Description of the internal string GetDescription() { string prefix = null == this.parent ? string.Empty : this.parent.GetDescription() + "."; return prefix + this.property.Name; } ////// Indicates whether original values of this member should be preserved. /// internal bool IsInteresting { get { // a member path is interesting if anything along the path is interesting return this.isLocallyInteresting || (null != this.parent && this.parent.IsInteresting); } } ////// Indicates whether this member represents a primary key value. /// internal bool IsKey { get { return this.isKey; } } ////// Indicates whether this member can be assigned a value of null. /// internal bool IsNullable { get { return this.property.Nullable; } } internal bool IsPrimitive { get { return this.property.TypeUsage.EdmType.BuiltInTypeKind == BuiltInTypeKind.PrimitiveType; } } ////// Gets the CLR type of the last member in the path. /// internal Type ClrType { get { return this.clrType; } } internal object GetValue(EntityDataSourceWrapper entity) { object parentObjectValue = GetParentObjectValue(entity, false /* initialize */); if (null == parentObjectValue) { // use convention that property of null is null return null; } else { // get this property object propertyValue = this.propertyInfo.GetValue(parentObjectValue, new object[] { }); return propertyValue; } } internal void SetValue(EntityDataSourceWrapper entity, object value) { object parentObjectValue = GetParentObjectValue(entity, true /* initialize */); // set property value on parent this.propertyInfo.SetValue(parentObjectValue, value, new object[] { }); } private object Initialize(EntityDataSourceWrapper entity) { // get parent's value object parentObjectValue = GetParentObjectValue(entity, true /* initialize */); // construct type instance for this property object propertyValue = EntityDataSourceUtil.InitializeType(this.ClrType); // set property this.propertyInfo.SetValue(parentObjectValue, propertyValue, new object[] { }); return propertyValue; } private object GetParentObjectValue(EntityDataSourceWrapper entity, bool initialize) { // get parent's value object parentObjectValue; if (null == this.parent) { // at the top level, the entity is the value parentObjectValue = entity.WrappedEntity; } else { parentObjectValue = this.parent.GetValue(entity); if (null == parentObjectValue && initialize) { parentObjectValue = this.parent.Initialize(entity); } } return parentObjectValue; } internal string GetEntitySqlValue() { // it.[member1].[member2]... string prefix; if (null != parent) { prefix = parent.GetEntitySqlValue(); } else { prefix = EntityDataSourceUtil.EntitySqlElementAlias; } string eSql = prefix + "." + EntityDataSourceUtil.QuoteEntitySqlIdentifier(this.property.Name); return eSql; } private bool IsPropertyAKey(EdmProperty property) { bool isKey = false; EntityType entityType = property.DeclaringType as EntityType; if (null != entityType) { isKey = entityType.KeyMembers.Contains(property); } return isKey; } public override string ToString() { string prefix = null == this.parent ? string.Empty : this.parent.ToString() + "->"; return prefix + this.property.Name; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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