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namespace System.Web.UI.WebControls {
using System;
using System.Collections;
using System.Diagnostics.CodeAnalysis;
using System.Reflection;
using System.Security.Permissions;
using System.Web;
using System.Web.Compilation;
using System.Web.UI;
public abstract class ContextDataSourceView : QueryableDataSourceView {
private string _entitySetName;
private string _contextTypeName;
private Type _contextType;
private string _entityTypeName;
private Type _entityType;
private Type _entitySetType;
private Control _owner;
protected static readonly object EventContextCreating = new object();
protected static readonly object EventContextCreated = new object();
protected static readonly object EventContextDisposing = new object();
protected ContextDataSourceView(DataSourceControl owner, string viewName, HttpContext context)
: base(owner, viewName, context) {
_owner = owner;
}
internal ContextDataSourceView(DataSourceControl owner, string viewName, HttpContext context, IDynamicQueryable queryable)
: base(owner, viewName, context, queryable) {
}
public string EntitySetName {
get {
return _entitySetName ?? String.Empty;
}
set {
if (_entitySetName != value) {
_entitySetName = value;
_entitySetType = null;
OnDataSourceViewChanged(EventArgs.Empty);
}
}
}
public string EntityTypeName {
get {
return _entityTypeName ?? String.Empty;
}
set {
if (_entityTypeName != value) {
_entityTypeName = value;
_entityType = null;
OnDataSourceViewChanged(EventArgs.Empty);
}
}
}
protected override Type EntityType {
get {
string typeName = EntityTypeName;
if (_entityType == null) {
_entityType = GetDataObjectTypeByName(typeName) ?? GetDataObjectType(EntitySetType);
}
return _entityType;
}
}
public virtual string ContextTypeName {
get {
return _contextTypeName ?? String.Empty;
}
set {
if (_contextTypeName != value) {
_contextTypeName = value;
_contextType = null;
OnDataSourceViewChanged(EventArgs.Empty);
}
}
}
public virtual Type ContextType {
get {
if (_contextType == null && !String.IsNullOrEmpty(ContextTypeName)) {
_contextType = DataSourceHelper.GetType(ContextTypeName);
}
return _contextType;
}
}
/// <summary>
/// Current Context
/// </summary>
protected object Context {
get;
set;
}
/// <summary>
/// Current EntitySet
/// </summary>
protected object EntitySet {
get;
private set;
}
[SuppressMessage("Microsoft.Naming", "CA1721:PropertyNamesShouldNotMatchGetMethods",
Justification = "The result of GetEntitySetType() is cached unless the EntitySetTypeName changes.")]
protected Type EntitySetType {
get {
if (_entitySetType == null) {
_entitySetType = GetEntitySetType();
}
return _entitySetType;
}
}
// Default implementation assumes the EntitySet is a property or field of the Context
protected virtual Type GetEntitySetType() {
MemberInfo mi = GetEntitySetMember(ContextType);
if (mi.MemberType == MemberTypes.Property) {
return ((PropertyInfo)mi).PropertyType;
}
else if (mi.MemberType == MemberTypes.Field) {
return ((FieldInfo)mi).FieldType;
}
//
throw new InvalidOperationException("EntitySet Type must be a field or property");
}
private MemberInfo GetEntitySetMember(Type contextType) {
string entitySetTypeName = EntitySetName;
if (String.IsNullOrEmpty(entitySetTypeName)) {
//
return null;
}
MemberInfo[] members = contextType.FindMembers(MemberTypes.Field | MemberTypes.Property,
BindingFlags.Public | BindingFlags.Instance |
BindingFlags.Static, /*filter*/null, /*filterCriteria*/null);
for (int i = 0; i < members.Length; i++) {
if (String.Equals(members[i].Name, entitySetTypeName, StringComparison.OrdinalIgnoreCase)) {
return members[i];
}
}
return null;
}
private static Type GetDataObjectTypeByName(string typeName) {
Type entityType = null;
if (!String.IsNullOrEmpty(typeName)) {
entityType = BuildManager.GetType(typeName, /*throwOnFail*/ false, /*ignoreCase*/ true);
}
return entityType;
}
protected virtual Type GetDataObjectType(Type type) {
if (type.IsGenericType) {
Type[] genericTypes = type.GetGenericArguments();
if (genericTypes.Length == 1) {
return genericTypes[0];
}
}
//
return typeof(object);
}
protected virtual ContextDataSourceContextData CreateContext(DataSourceOperation operation) {
return null;
}
protected override object GetSource(QueryContext context) {
ContextDataSourceContextData contextData = CreateContext(DataSourceOperation.Select);
if (contextData != null) {
// Set the current context
Context = contextData.Context;
EntitySet = contextData.EntitySet;
return EntitySet;
}
return null;
}
protected override int ExecuteUpdate(IDictionary keys, IDictionary values, IDictionary oldValues) {
ContextDataSourceContextData contextData = null;
try {
contextData = CreateContext(DataSourceOperation.Update);
if (contextData != null) {
// Set the current context
Context = contextData.Context;
EntitySet = contextData.EntitySet;
return base.ExecuteUpdate(keys, values, oldValues);
}
}
finally {
DisposeContext();
}
return -1;
}
protected override int ExecuteDelete(IDictionary keys, IDictionary oldValues) {
ContextDataSourceContextData contextData = null;
try {
contextData = CreateContext(DataSourceOperation.Delete);
if (contextData != null) {
// Set the current context
Context = contextData.Context;
EntitySet = contextData.EntitySet;
return base.ExecuteDelete(keys, oldValues);
}
}
finally {
DisposeContext();
}
return -1;
}
protected override int ExecuteInsert(IDictionary values) {
ContextDataSourceContextData contextData = null;
try {
contextData = CreateContext(DataSourceOperation.Insert);
if (contextData != null) {
// Set the current context
Context = contextData.Context;
EntitySet = contextData.EntitySet;
return base.ExecuteInsert(values);
}
}
finally {
DisposeContext();
}
return -1;
}
protected virtual void DisposeContext(object dataContext) {
if (dataContext != null) {
IDisposable disposableObject = dataContext as IDisposable;
if (disposableObject != null) {
disposableObject.Dispose();
}
dataContext = null;
}
}
protected void DisposeContext() {
DisposeContext(Context);
}
}
}
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