从字符串创建类型 [英] Creating Type from string
本文介绍了从字符串创建类型的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
对于我的持久性库,我想动态创建类型。
不幸的是我遇到泛型类型的问题。下面的代码在运行时失败,我不知道为什么:
var tDict = Type.GetType( System.Collections.Generic.Dictionary`2 []) ;
var tDict2 = tDict.MakeGenericType( typeof ( int ), typeof ( string ));
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例外是:
InvalidOperationException:其他信息:System.Collections.Generic.Dictionary`2 [TKey,TValue] []不是GenericTypeDefinition。 MakeGenericType只能在Type.IsGenericTypeDefinition为true的类型上调用。
解决方案
以下代码可以解决问题:
私人 void test()
{
类型tDict = Type.GetType( System.Collections.Generic.Dictionary`2 [System.Int32,System.String])。GetGenericTypeDefinition();
var tDict3 = tDict.MakeGenericType( typeof ( string ), typeof ( string ));
var tDict2 = tDict.MakeGenericType( typeof ( int ), typeof ( string ));
}
已解决!
var tDict = Type.GetType( System.Collections.Generic.Dictionary`2);
有效!! :)
For my persistence library I would like to create type dynamically.
Unfortunately I have a problem with generic types. The code below fails at runtime and I have no clue why:
var tDict = Type.GetType("System.Collections.Generic.Dictionary`2[]");
var tDict2 = tDict.MakeGenericType(typeof(int), typeof(string));
The exception is:
InvalidOperationException:Additional information: System.Collections.Generic.Dictionary`2[TKey,TValue][] is not a GenericTypeDefinition. MakeGenericType may only be called on a type for which Type.IsGenericTypeDefinition is true.
解决方案
The following code makes the trick:
private void test() { Type tDict = Type.GetType("System.Collections.Generic.Dictionary`2[System.Int32, System.String]").GetGenericTypeDefinition(); var tDict3 = tDict.MakeGenericType(typeof(string), typeof(string)); var tDict2 = tDict.MakeGenericType(typeof(int), typeof(string)); }
Solved!
var tDict = Type.GetType("System.Collections.Generic.Dictionary`2");
works!! :)
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