比较两个结构“在C＃中值 [英] Compare two structs' values in C#

问题描述

我不找两个结构返回布尔的比较，我想知道是否有办法让两个结构中哪些字段（相同的结构，但也许不同的值）是不同的。基本上，我希望有一个简单的方法来做到以下几点：

I'm not looking for a comparison of two structs that returns bool, I am wondering if there is a way to get which fields of two structs (the same structure, but maybe different values) are different. Basically I want a simpler way to do the following:

public class Diff
{
    public String VarName;
    public object Val1;
    public object Val2;

    public Diff(String varName, object val1, object val2)
    {
        VarName = varName;
        Val1 = val1;
        Val2 = val2;
    }

    public override string ToString()
    {
        return VarName + " differs with values " + Val1 + " and " + Val2;
    }
}

public struct TestStruct
{
    public int ValueOne;
    public int ValueTwo;
    public int ValueThree;

    public List Compare(TestStruct inTestStruct)
    {
        List diffs = new List();
        if (ValueOne != inTestStruct.ValueOne)
        {
            diffs.Add(new Diff("ValueOne", ValueOne, inTestStruct.ValueOne));
        }
        if (ValueTwo != inTestStruct.ValueTwo)
        {
            diffs.Add(new Diff("ValueTwo", ValueTwo, inTestStruct.ValueTwo));
        }
        if (ValueThree != inTestStruct.ValueThree)
        {
            diffs.Add(new Diff("ValueThree", ValueThree, inTestStruct.ValueThree));
        }
        return diffs;
    }
}

public CompareStructsExample()
{
    TestStruct t1 = new TestStruct();
    t1.ValueOne = 1;
    t1.ValueTwo = 8;
    t1.ValueThree = 5;

    TestStruct t2 = new TestStruct();
    t2.ValueOne = 3;
    t2.ValueTwo = 8;
    t2.ValueThree = 7;

    List diffs = t1.Compare(t2);
    foreach (Diff d in diffs)
    {
        System.Console.WriteLine(d.ToString());
    }
}

我不知道是否有一种方法做这种带有某种序列化，或者如果这是真正看到了哪些值改变的唯一方式。即使是实现比较功能更好的方法，我会采取这一点。

I'm wondering if there is a way to do this with serialization of some sort, or if this is the only way to actually see which values have changed. Even if there is a better way to implement the Compare function, I would take that too.

推荐答案

可以使用反射进行。检查字段信息并的的PropertyInfo 例子。

It can be done using Reflection. Check for FieldInfo and PropertyInfo examples.

MSDN示例（修改了一下）：

MSDN example (modified a bit):

    Type myType = typeof(TestStruct);

    // Get the fields of TestStruct.
    FieldInfo[] myFieldInfo = 
        myType.GetFields(
           BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public);

    Console.WriteLine("\nThe fields of TestStruct are \n");

    // Display the field information of TestStruct.
    for(int i = 0; i < myFieldInfo.Length; i++)
    {
        Console.WriteLine("\nName            : {0}", myFieldInfo[i].Name);
        Console.WriteLine("Declaring Type  : {0}", myFieldInfo[i].DeclaringType);
        Console.WriteLine("IsPublic        : {0}", myFieldInfo[i].IsPublic);
        Console.WriteLine("MemberType      : {0}", myFieldInfo[i].MemberType);
        Console.WriteLine("FieldType       : {0}", myFieldInfo[i].FieldType);
        Console.WriteLine("IsFamily        : {0}", myFieldInfo[i].IsFamily);
    }

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