使用集合初始化程序初始化WebControl对象的Attributes属性 [英] Initialize the Attributes property of a WebControl object using collection initializer

问题描述

我想内联初始化WebControl对象，但是对于某些字段，这有点棘手.例如，当我尝试初始化的Attributes属性时TextBox 对象是这样的:

I want to initialize WebControl objects, inline, but for some fields this is a little bit tricky. For instance when I try to initialize the Attributes property of a TextBox object like this:

using System.Web.UI.WebControls;
Panel panel = new Panel() { Controls = { new TextBox() { Attributes = { { "key", "value" } } } } };

我得到了错误:

无法使用集合初始化类型' AttributeCollection ' 初始化程序，因为它没有实现 'System.Collections.IEnumerable'

Cannot initialize type 'AttributeCollection' with a collection initializer because it does not implement 'System.Collections.IEnumerable'

任何想法在这种情况下内联初始化如何工作?

Any idea how could inline initialization work in this case ?

推荐答案

您可以执行此操作，但如果使用的是C#6.这称为索引初始化，因此请尝试以下代码，但是正如我所说的，这在Visual Studio 2015和C#6中应该可以正常工作:

You can do this but if you use C#6. This is called index initialization so try the following code but as I said this should works fine in Visual Studio 2015 and C#6:

Panel panel = new Panel
{
    Controls =
    {
        new TextBox
        {
            Attributes =
            {
                ["readonly"] = "true",
                ["value"] = "Hi"
            }
        }
    }
}; 

旧的集合初始值设定项( C#6之前的)仅与实现

The old collection initializers (Prior to C#6) only works with types that implement IEnumerable<T> and have an Add method. But now any type with an indexer will allow initialization via this syntax.

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