我如何告诉如果ObjectDataSource控件OnSelected事件呼吁selectme​​thod或selectcountmethod？ [英] How do I tell if the ObjectDataSource OnSelected event was called for the selectmethod or selectcountmethod?

问题描述

我有一个对象的数据源，看起来像这样：

I have an object datasource that looks like this:

<asp:ObjectDataSource ID="obdsList" runat="server" 
EnablePaging="True" SelectCountMethod="GetCountByID" SortParameterName="sortExpression"
    OldValuesParameterFormatString="original_{0}" SelectMethod="GetByID" 
    TypeName="Services.Users" 
    onselected="obdsList_Selected">
    <SelectParameters>
        <asp:QueryStringParameter Name="ID" QueryStringField="ID" 
            Type="Int32" />           
    </SelectParameters>
</asp:ObjectDataSource>

和这样的onselected事件：

And a onselected event like this:

protected void obdsList_Selected(object sender, ObjectDataSourceStatusEventArgs e) {
}

但是，事件方法被调用了两次。一旦我返回列表中，并用返回的Int32计数一次。如果我想投 e.ReturnValue 来返回列表如何计数和选择方法区分？我可以做一个 e.ReturnValue.GetType（）的ToString（）但是，似乎是一个黑客攻击。

However, the event method is being called twice.. once with my returned list, and once with the returned Int32 count. If I want to cast e.ReturnValue to the return List how do I differentiate between the count and select methods? I can do a e.ReturnValue.GetType().ToString() but that seems like a hack.

推荐答案

我这样做...

protected void obdsList_Selected(object sender, ObjectDataSourceStatusEventArgs e)
{
    if (e.ReturnValue != null)
    {
        if (e.ReturnValue.GetType() == typeof(int))
        {
            //e.ReturnValue is the SelectCountMethod value
        }                
    }
}

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