protected override ContextDataSourceContextData CreateContext(DataSourceOperation operation)
{
var tablePropertyInfo = this.ContextType.GetProperty(this.EntitySetName);
var result = new ContextDataSourceContextData(Activator.CreateInstance(this.ContextType));
result.EntitySet = tablePropertyInfo.GetValue(result.Context, null);
return result;
}
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 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);
}
private ContextDataSourceContextData CreateContextAndTableForEdit(DataSourceOperation operation)
{
ContextDataSourceContextData contextData = CreateContextAndTable(operation);
// context data may be null or incomplete if an exception was handled
if (contextData != null)
{
if (contextData.Context == null)
{
return(null);
}
if (contextData.EntitySet == null)
{
DisposeContext(contextData.Context);
return(null);
}
ValidateContextType(contextData.Context.GetType(), false);
ValidateTableType(contextData.EntitySet.GetType(), false);
}
return(contextData);
}
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);
}
private ContextDataSourceContextData CreateContextAndTableForSelect()
{
_isNewContext = false;
if (_selectContexts == null)
{
_selectContexts = new List <ContextDataSourceContextData>();
}
else if (_reuseSelectContext && _selectContexts.Count > 0)
{
return(_selectContexts[_selectContexts.Count - 1]);
}
// context data may be null if an exception was handled
ContextDataSourceContextData contextData = CreateContextAndTable(DataSourceOperation.Select);
if (contextData != null)
{
if (contextData.Context != null)
{
ValidateContextType(contextData.Context.GetType(), true);
}
if (contextData.EntitySet != null)
{
ValidateTableType(contextData.EntitySet.GetType(), true);
}
_selectContexts.Add(contextData);
// context may not be dlinq context or may be null if table was static.
DataContext dlinqContext = contextData.Context as DataContext;
if ((dlinqContext != null) && _isNewContext)
{
dlinqContext.ObjectTrackingEnabled = EnableObjectTracking;
}
// don't reuse dlinq contexts that cache data or exterior changes will not be reflected.
_reuseSelectContext = (dlinqContext == null) || !EnableObjectTracking;
}
return(contextData);
}
private ContextDataSourceContextData CreateContextAndTable(DataSourceOperation operation)
{
ContextDataSourceContextData contextData = null;
bool eventFired = false;
try {
LinqDataSourceContextEventArgs contextEventArgs = new LinqDataSourceContextEventArgs(operation);
OnContextCreating(contextEventArgs);
contextData = new ContextDataSourceContextData(contextEventArgs.ObjectInstance);
Type contextType = null;
MemberInfo tableMemberInfo = null;
if (contextData.Context == null)
{
// construct the context unless accessing a static table for Select.
contextType = ContextType;
tableMemberInfo = GetTableMemberInfo(contextType);
if (tableMemberInfo != null)
{
if (MemberIsStatic(tableMemberInfo))
{
if (operation != DataSourceOperation.Select)
{
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
AtlasWeb.LinqDataSourceView_TableCannotBeStatic, TableName, contextType.Name, _owner.ID));
}
}
else
{
contextData.Context = CreateContext(contextType);
_isNewContext = true;
}
}
}
else
{
// use the manually constructed context.
tableMemberInfo = GetTableMemberInfo(contextData.Context.GetType());
}
// fetch the table from the context.
if (tableMemberInfo != null)
{
FieldInfo field = tableMemberInfo as FieldInfo;
if (field != null)
{
contextData.EntitySet = field.GetValue(contextData.Context);
}
PropertyInfo property = tableMemberInfo as PropertyInfo;
if (property != null)
{
contextData.EntitySet = property.GetValue(contextData.Context, null);
}
}
if (contextData.EntitySet == null)
{
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
AtlasWeb.LinqDataSourceView_TableNameNotFound, TableName, contextType.Name, _owner.ID));
}
}
catch (Exception e) {
eventFired = true;
LinqDataSourceStatusEventArgs createdEventArgs = new LinqDataSourceStatusEventArgs(e);
OnContextCreated(createdEventArgs);
OnException(new DynamicValidatorEventArgs(e, DynamicDataSourceOperation.ContextCreate));
// CreateContextAndTable will return null if this exception is handled.
if (!createdEventArgs.ExceptionHandled)
{
throw;
}
}
finally {
if (!eventFired)
{
// contextData can be null if exception thrown from ContextCreating handler.
object context = (contextData == null) ? null : contextData.Context;
LinqDataSourceStatusEventArgs createdEventArgs = new LinqDataSourceStatusEventArgs(context);
OnContextCreated(createdEventArgs);
}
}
return(contextData);
}
private ContextDataSourceContextData CreateContextAndTable(DataSourceOperation operation) {
ContextDataSourceContextData contextData = null;
bool eventFired = false;
try {
LinqDataSourceContextEventArgs contextEventArgs = new LinqDataSourceContextEventArgs(operation);
OnContextCreating(contextEventArgs);
contextData = new ContextDataSourceContextData(contextEventArgs.ObjectInstance);
Type contextType = null;
MemberInfo tableMemberInfo = null;
if (contextData.Context == null) {
// construct the context unless accessing a static table for Select.
contextType = ContextType;
tableMemberInfo = GetTableMemberInfo(contextType);
if (tableMemberInfo != null) {
if (MemberIsStatic(tableMemberInfo)) {
if (operation != DataSourceOperation.Select) {
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
AtlasWeb.LinqDataSourceView_TableCannotBeStatic, TableName, contextType.Name, _owner.ID));
}
}
else {
contextData.Context = CreateContext(contextType);
_isNewContext = true;
}
}
}
else {
// use the manually constructed context.
tableMemberInfo = GetTableMemberInfo(contextData.Context.GetType());
}
// fetch the table from the context.
if (tableMemberInfo != null) {
FieldInfo field = tableMemberInfo as FieldInfo;
if (field != null) {
contextData.EntitySet = field.GetValue(contextData.Context);
}
PropertyInfo property = tableMemberInfo as PropertyInfo;
if (property != null) {
contextData.EntitySet = property.GetValue(contextData.Context, null);
}
}
if (contextData.EntitySet == null) {
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
AtlasWeb.LinqDataSourceView_TableNameNotFound, TableName, contextType.Name, _owner.ID));
}
}
catch (Exception e) {
eventFired = true;
LinqDataSourceStatusEventArgs createdEventArgs = new LinqDataSourceStatusEventArgs(e);
OnContextCreated(createdEventArgs);
OnException(new DynamicValidatorEventArgs(e, DynamicDataSourceOperation.ContextCreate));
// CreateContextAndTable will return null if this exception is handled.
if (!createdEventArgs.ExceptionHandled) {
throw;
}
}
finally {
if (!eventFired) {
// contextData can be null if exception thrown from ContextCreating handler.
object context = (contextData == null) ? null : contextData.Context;
LinqDataSourceStatusEventArgs createdEventArgs = new LinqDataSourceStatusEventArgs(context);
OnContextCreated(createdEventArgs);
}
}
return contextData;
}
