页面设计中的错误处理（源）

Question

I have a control in GridView which converts dateformat From MMddyyyy To ddMMyyyy .

<ItemTemplate>
  <asp:Label ID="lblName" runat="server"
       Text='<%# Eval("Value1") != DBNull.Value ? 
                (Convert.ToDateTime(Eval("Value1")).ToString("dd/MM/yyyy")) : Eval("Value1") %>'>
  </asp:Label>
</ItemTemplate>

This works perfectly if it gets a date or null value.

But in my case Value1 (the Bind Field) can be a string containing anything. say - 'garbageStr' .

So it fails to convert to date and throws error.

Instead I want to display null or blank value when it fails to convert to DateTime format.

Is there any way to handle this?

Answer 1

您可以在后面的代码中为此定义一个方法，然后调用它，然后在方法实现中尝试在DateTime.TryParse转换，并返回相应的字符串

Answer 2

In your aspx file:

<asp:Label ID="lblName" runat="server" Text='<%# ReturnPropertDateTime(Eval("Value1")) %>'>   </asp:Label> 

In your Code Behind file:

protected DateTime ReturnPropertDateTime(object val)
{
        DateTime dt = null;
         string dateTimeValue = Convert.ToString(val);
    DateTime dateTime2;
    if (DateTime.TryParse(dateTimeValue.ToString("ddMMyyyy"), out dateTime2))
    {
        dt = dateTime2;     
      }
    else
    {
         dt = // Just Assign Default date time value you want.
    }

return dt;

}

Although its tedious, but you can make your aspx file more readable through this approach as it prevents clutering and provide flexible handling.