初始化程序语法：new ViewDataDictionary {{“名称”，“值” }} [英] Initializer syntax: new ViewDataDictionary { { "Name", "Value" } }

问题描述

我正在寻找一种将ViewDataDictionary传递到ASP.NET MVC中的部分视图的方法，这种语法是我想到的：

I was searching for a way to pass ViewDataDictionary to a partial view in ASP.NET MVC that I came to this syntax:

new ViewDataDictionary { { "Name", "Value" } }

我有点困惑关于初始化语法。有人可以向我解释吗？

I'm a bit confused about the initializer syntax here. can anyone explain it to me?

推荐答案

ViewDataDictionary 实现了 IDictionary<字符串，对象> 。

IDictionary<字符串，对象> 本质上是 KeyValuePair< string，object> 的集合。

您的 ViewDataDictionary 初始值设定项（外部花括号）包含另一组花括号，表示 KeyValuePair< string，object> 初始值设定项。

Your ViewDataDictionary initializer (outer curly braces) contains another set of curly braces that represents a KeyValuePair<string, object> initializer.

可能的原因在此答案中进行了说明。

The reason this is possible is explained in this answer.

您可以通过逗号分隔 KeyValuePair< string，object> 初始值设定项来添加多个项目：

You can Add multiple items by comma separating the KeyValuePair<string, object> initializers:

var data = new ViewDataDictionary 
{ 
    { "Name", "Value" }, 
    { "Name2", "Value2" } 
};

与以下内容相同：

var data = new ViewDataDictionary 
{ 
    new KeyValuePair<string, object>("Name", "Value"), 
    new KeyValuePair<string, object>("Name2", "Value2") 
};

本质上，内部花括号是初始化 KeyValuePair< string的不错语法， object> 对象。

Essentially, the inner curly braces are nice syntax for initializing KeyValuePair<string, object> objects.

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