private static PropertyInfo GetCollectionPropertyInfoFor <TItem, TPropertyCollectionItem>(
Expressions.Expression <Func <TItem,
IEnumerable <TPropertyCollectionItem> > > propertyExpression)
{
if (propertyExpression == null)
{
throw new ArgumentNullException("propertyExpression");
}
var memberExp = propertyExpression.Body as Expressions.MemberExpression;
if (memberExp == null)
{
throw new ArgumentNullException("propertyExpression");
}
var propInfo = memberExp.Member as PropertyInfo;
if (propInfo == null)
{
throw new ArgumentNullException("propertyExpression");
}
if (!propInfo.DeclaringType.IsAssignableFrom(typeof(TItem)))
{
throw new ArgumentException("propertyExpression");
}
return(propInfo);
}
private void ReinitializeColumns()
{
Expressions.Expression<Func<Item, IEnumerable<Int32>>> exp =
obj =>
obj.MyColumns;
this.dataGrid.RegenerateColumns(exp,
this.Items);
}
public static void RegenerateColumns <TItem, TPropertyCollectionItem>(
this DataGrid dataGrid,
Expressions.Expression <Func <TItem, IEnumerable <TPropertyCollectionItem> > > propertyExpression,
IEnumerable <TItem> items)
{
RegenerateColumns <TItem, TPropertyCollectionItem>(dataGrid,
propertyExpression,
items,
(index) =>
String.Format("Column - {0}", index));
}
public static void RegenerateColumns <TItem, TPropertyCollectionItem>(
this DataGrid dataGrid,
Expressions.Expression <Func <TItem, IEnumerable <TPropertyCollectionItem> > > collectionPropertyExpression,
IEnumerable <TItem> items,
Func <Int32, String> formatHeader)
{
if (dataGrid == null)
{
throw new ArgumentNullException("dataGrid");
}
if (collectionPropertyExpression == null)
{
throw new ArgumentNullException("propertyExpression");
}
if (items == null)
{
throw new ArgumentNullException("items");
}
if (formatHeader == null)
{
throw new ArgumentNullException("formatHeader");
}
var collectionPropInfo = GetCollectionPropertyInfoFor <TItem, TPropertyCollectionItem>(collectionPropertyExpression);
var propertyName = collectionPropInfo.Name;
var getCount = GetCountGetter <TItem, TPropertyCollectionItem>(
collectionPropertyExpression.Compile(),
collectionPropInfo);
// Remove old autocolumns
dataGrid.RemoveAutoGeneratedColumns(propertyName);
Int32 maxColumnsAdded = 0;
// Create new columns
foreach (var item in items)
{
GenerateColumnsForItem(dataGrid,
item,
getCount,
formatHeader,
propertyName,
ref maxColumnsAdded);
}
}