C＃词典透视Linq

Question

I've a Dictionary like this:

Key | Value
C1  | 1
C2  | 2
C3  | 3

Now I need some linq statement or lambda expression (or other mechanism) to return new object like this:

new { C1 = 1, C2 = 2, C3 = 3}.

The problem is that the keys' values are known only at runtime, as I know only at runtime how many properies my new anonimous object has and their names.

Can anyone suggest me how reach my goal?

Answer 1

You can use a combination of an ExpandoObject and dynamic .

var data = new Dictionary<string, int> {
    { "C1", 1},
    { "C2", 2},
    { "C3", 3}
};
var expandoObject = new ExpandoObject() as IDictionary<string, Object>;
foreach (var kvp in data) {
    expandoObject.Add(kvp.Key, kvp.Value);
}
dynamic pivotedData = expandoObject;

Console.WriteLine(pivotedData.C1);
Console.WriteLine(pivotedData.C2);
Console.WriteLine(pivotedData.C3);
Console.ReadLine();

This will yield:

1
2
3

You can probably make a nice extension method out of it.

Answer 2

这是不可能的。如果在编译时不知道结果对象的属性，就不能使用它，而不必跳过反射箍（使用字典会更容易）。