在 C# 中比较两个结构的值 [英] Compare two structs' values in C#

问题描述

我不是在寻找返回 bool 的两个结构的比较，我想知道是否有办法获取两个结构的哪些字段(相同的结构，但可能是不同的值)是不同的.基本上我想要一种更简单的方法来执行以下操作:

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());
    }
}

我想知道是否有办法通过某种序列化来做到这一点，或者这是否是实际查看哪些值已更改的唯一方法.即使有更好的方法来实现比较功能，我也会采用.

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

可以使用反射来完成.检查 FieldInfo 和 PropertyInfo 示例.

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

MSDN 示例(稍作修改):

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("
The fields of TestStruct are 
");

    // Display the field information of TestStruct.
    for(int i = 0; i < myFieldInfo.Length; i++)
    {
        Console.WriteLine("
Name            : {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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