DataGridView 未绑定 IEnumerable但 List确实如此
我已经编写了这段代码：
public List<TResult> SelectAll<TResult>(Func<Regions, TResult> selector) where TResult : class
{
using (RepositoryDataContext = new DataClasses1DataContext())
{
return RepositoryDataContext.Regions.Select<Regions, TResult>(selector).ToList<TResult>();
}
}
并以这种方式从表单调用它：
dgvFindFirst.DataSource = clsr.SelectAll<SelectAllRegion>(MY SELECT LAMBDA EXP);
但是当编写这样的方法时：
public IEnumerable<TResult> SelectAll<TResult>(Func<Regions, TResult> selector) where TResult : class
{
using (RepositoryDataContext = new DataClasses1DataContext())
{
return RepositoryDataContext.Regions.Select<Regions, TResult>(selector).AsEnumerable<TResult>();
}
}
DataGridView Not Bound any Nothing 返回。 问题是什么？
I've written this code:
public List<TResult> SelectAll<TResult>(Func<Regions, TResult> selector) where TResult : class
{
using (RepositoryDataContext = new DataClasses1DataContext())
{
return RepositoryDataContext.Regions.Select<Regions, TResult>(selector).ToList<TResult>();
}
}
and call it from the Form this way:
dgvFindFirst.DataSource = clsr.SelectAll<SelectAllRegion>(MY SELECT LAMBDA EXP);
but when write a method like this :
public IEnumerable<TResult> SelectAll<TResult>(Func<Regions, TResult> selector) where TResult : class
{
using (RepositoryDataContext = new DataClasses1DataContext())
{
return RepositoryDataContext.Regions.Select<Regions, TResult>(selector).AsEnumerable<TResult>();
}
}
DataGridView Not Bound any Nothing returns.
What is the problem?
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DataGridViewDataSource属性可以是实现以下接口之一的任何对象：IList、IListSource、IBindingList或IBindingListView，List可以，但IEnumberable不会。参考： http://msdn.microsoft.com /en-us/library/system.windows.forms.datagridview.datasource.aspxThe
DataGridViewDataSourceproperty can be any object that implements one of these interfaces:IList,IListSource,IBindingListorIBindingListView, whichList<T>does, butIEnumberable<T>doesn't. Reference: http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.datasource.aspx