如何指定一个自定义的.NET Web控件所需的属性？ [英] How do I specify a required attribute in a custom .NET Web control?

问题描述

private string _itemId;

[Browsable(true),
Description("Required identifier for the Item.")]
public string ItemId
{
    get { return _itemId; }
    set
    {
    	if (string.IsNullOrEmpty(_itemId))
    	{
    		_itemId = value;
    	}
    }
}

如何将我居然提出，当有人使用的控制？我试图找到一个属性，它说像必需（真）。

How would I actually make that required when someone uses the control? I'm trying to find an attribute that says something like Required(true).

推荐答案

我不知道，有此属性。我相信，在Page_Load事件（或者一些渲染事件）只检查是否值已设置。如果没有，那么抛出异常。

I don't know that there's an attribute for this. I believe on the Page_Load event (or perhaps some rendering event) just check if the value has been set. If not then throw an exception.

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