转换为以字符串格式给出的数据类型 [英] Convert to a datatype given in string format

问题描述

我一直在寻找解决方案很长一段时间，但找不到任何接近的东西.

I have been searching for a solution for quite a while now and couldn't find anything close.

我想要达到的目标:
我有两个字符串，'a' 和 'b'.字符串 'a' 包含一个数据类型，例如Boolean".
字符串 b 包含1"或False"之类的值，可以是任何值.
我希望能够将字符串 'b' 的值存储在数据类型为字符串 'a' 的变量中.

What I want to achieve:
I have two strings, 'a' and 'b'. String 'a' contains a datatype, for example "Boolean".
String b contains a value like "1" or "False", could be anything.
I want to be able to store the value of string 'b' in a variable which has the datatype of string 'a'.

如果我使用示例中给出的相同值遍历结果列表，结果将如下所示:

If I would itterate trough a list of results with the same values as given in the example the results would be as following:

Foreach(var value in MyList)
{
  if(!var ConvertTo a) //Result would be negative because for "1" for it is not a boolean value, however if 'a' is "Int32" the result would be true.
    continue;  
  else 
  {//The value "False" is convertable to boolean, so the result would true
    Create a variable with datatype boolean with the value 'false'.
  }
}

或多或少我正在寻找一些奇怪的 TryParse() 黑客版本.

More or less i'm in search of some strangly hacked version of TryParse().

我在示例中使用了布尔值，但这可以是任何数据类型.至少我应该能够处理至少以下数据类型:

I used boolean in my example, but this can be any datatype. At least I should be able to handle atleast the following datatypes:

• Int、Int32、Int64
• 字符串
• 布尔值
• 浮点数，十进制
• 日期时间

我的问题:
是否有可能以任何方式(尝试)将值转换为字符串中给定的任何数据类型?

My question:
Is it possible in any way to (try to) convert a value to any datatype given in a string?

我希望我的问题和例子是清楚的，如果不是，请发表评论.

I hope my question and example is clear, if not please leave a comment.

推荐答案

您必须将字符串映射到类型.由于并非所有这些都是 System. 直接，我会考虑创建一个映射:

You have to map the strings to a type. Since not all of them are System.<yourType> directly, I would consider creating a mapping:

Dictionary<string, Type> types = new Dictionary<string, Type>();
types.Add("int", typeof(System.Int32);
//etc.

然后，使用 Convert.ChangeType 来获取您的对象:

Then, use Convert.ChangeType to get your object:

object myObj = Convert.ChangeType(b, types[a]);

如果您的类型映射中不存在键，也许您可​​以通过尝试获取类型来扩展它:

Maybe you could extend this by trying to get the type if the key does not exist in your type mapping:

object myObj = Convert.ChangeType(b, Type.GetType("System." + a));

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