protected virtual void OnContextCreating(LinqDataSourceContextEventArgs e)
{
if (ContextCreating != null)
{
ContextCreating(this, e);
}
}
protected virtual void OnContextCreating(LinqDataSourceContextEventArgs e)
{
EventHandler <LinqDataSourceContextEventArgs> handler = (EventHandler <LinqDataSourceContextEventArgs>)Events[EventContextCreating];
if (handler != null)
{
handler(this, e);
}
}
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);
}
protected virtual void OnContextCreating (LinqDataSourceContextEventArgs e)
{
if (ContextCreating != null)
ContextCreating (this, e);
}
protected void LinqDataSource1_ContextCreating(object sender, LinqDataSourceContextEventArgs e)
{
e.ObjectInstance = new PhotoAlbumDataSource(this.CurrentPath);
}
protected void lds_ContextCreating(object sender, LinqDataSourceContextEventArgs e)
{
e.ObjectInstance = new PubsDataContext();
}
protected void ShoppingCartLinqDataSource_ContextCreating(object sender, LinqDataSourceContextEventArgs e)
{
e.ObjectInstance = new ShoppingCartContext(Context.User.Identity.Name);
}
protected virtual void OnContextCreating(LinqDataSourceContextEventArgs e) {
EventHandler<LinqDataSourceContextEventArgs> handler = (EventHandler<LinqDataSourceContextEventArgs>)Events[EventContextCreating];
if (handler != null) {
handler(this, e);
}
}
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;
}
