如何在.NET (C#)中检查两个GUID是否匹配？

Question

如何检查两个GUID是否匹配？

使用以下C#代码，如何匹配g2与g1具有相同的GUID：

Guid g1 = new Guid("{10349469-c6f7-4061-b2ab-9fb4763aeaed}");
Guid g2 = new Guid("{45DF902E-2ECF-457A-BB0A-E04487F71D63}");

- Amit Bhagat

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Guid 正确实现了相等性，因此可以使用 Equals 或 == 进行比较。 - Adam Houldsworth

Answer 1

您可以使用Guid.Equals的两个重载之一。因此，从实际角度来看：

Guid g1 = ...
Guid g2 = ...

if (g1.Equals(g2)) { /* guids are equal */ }

请注意，System.Guid 实现了等号运算符，因此以下代码也可以正常工作：

if (g1 == g2) { /* guids are equal */ }

- Christian.K

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感谢您指出正确的方向，我以为 Equals 是按引用类型匹配的。 - Amit Bhagat

@AmitKB 请查看public bool Equals(Guid g)。 - Martin Backasch

Answer 2

ToString() 方法可以将 GUID 转换为一致的字符串值，因此可以用于匹配。

请查看 this DotNetFiddle 进行测试。

using System;

public class Program
{
    public static void Main()
    {
        // Two distinct GUIDs
        Guid g1 = new Guid("{10349469-c6f7-4061-b2ab-9fb4763aeaed}");
        Guid g2 = new Guid("{45DF902E-2ECF-457A-BB0A-E04487F71D63}");       

        // GUID similar to 'g1' but with mixed case
        Guid g1a = new Guid("{10349469-c6f7-4061-b2ab-9fb4763AEAED}");

        // GUID similear to 'g1' but without braces
        Guid g1b = new Guid("10349469-c6f7-4061-b2ab-9fb4763AEAED");

        // Show string value of g1,g2 and g3
        Console.WriteLine("g1 as string: {0}\n", g1.ToString());
        Console.WriteLine("g2 as string: {0}\n", g2.ToString());
        Console.WriteLine("g1a as string: {0}\n", g1a.ToString());
        Console.WriteLine("g1b as string: {0}\n", g1b.ToString());

        // g1 to g1a match result
        bool resultA = (g1.ToString() == g1a.ToString());

        // g1 to g1b match result
        bool resultB = (g1.ToString() == g1b.ToString());

        // Show match result
        Console.WriteLine("g1 matches to g1a: {0}\n", resultA );
        Console.WriteLine("g1 matches to g1b: {0}", resultB );      
    }
}

输出

g1作为字符串：10349469-c6f7-4061-b2ab-9fb4763aeaed

g2作为字符串：45df902e-2ecf-457a-bb0a-e04487f71d63

g1a作为字符串：10349469-c6f7-4061-b2ab-9fb4763aeaed

g1b作为字符串：10349469-c6f7-4061-b2ab-9fb4763aeaed

g1与g1a匹配：真

g1与g1b匹配：真

- Amit Bhagat

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毫无必要将其转换为字符串，这会增加不必要的开销——这是一个糟糕的想法。只需使用g1 == g2或g1.Equals(g2)即可。 - DavidG