C#:如何获取某个类型的所有公共(包括 get 和 set)字符串属性 [英] C#: How to get all public (both get and set) string properties of a type

问题描述

我正在尝试创建一个方法，该方法将遍历通用对象列表并替换其类型为 string 的所有属性，该属性为 null 或用替换为空.

I am trying to make a method that will go through a list of generic objects and replace all their properties of type string which is either null or empty with a replacement.

这样做的好方法是什么?

How is a good way to do this?

我有这种……外壳……到目前为止:

I have this kind of... shell... so far:

public static void ReplaceEmptyStrings<T>(List<T> list, string replacement)
{
    var properties = typeof(T).GetProperties( -- What BindingFlags? -- );

    foreach(var p in properties)
    {
        foreach(var item in list)
        {
            if(string.IsNullOrEmpty((string) p.GetValue(item, null)))
                p.SetValue(item, replacement, null);
        }
    }
}

那么，我如何找到一个类型的所有属性:

So, how do I find all the properties of a type that are:

• string

有公开的get

有公开的set

?

我做了这个测试类:

class TestSubject
{
    public string Public;
    private string Private;

    public string PublicPublic { get; set; }
    public string PublicPrivate { get; private set; }
    public string PrivatePublic { private get; set; }
    private string PrivatePrivate { get; set; }
}

以下不起作用:

var properties = typeof(TestSubject)
        .GetProperties(BindingFlags.Instance|BindingFlags.Public)
        .Where(ø => ø.CanRead && ø.CanWrite)
        .Where(ø => ø.PropertyType == typeof(string));

如果我打印出我到达那里的那些属性的名称，我会得到:

If I print out the Name of those properties I get there, I get:

公共公共公私私人公共

换句话说，我得到了太多的两个属性.

In other words, I get two properties too much.

注意:这可能会以更好的方式完成...使用嵌套的 foreach 和反射以及所有这些...但是如果您有任何好的替代想法，请告诉我知道因为我想学习！

Note: This could probably be done in a better way... using nested foreach and reflection and all here... but if you have any great alternative ideas, please let me know cause I want to learn!

推荐答案

您的代码已重写.不使用 LINQ 或 var.

Your code rewritten. Does not use LINQ nor var.

public static void ReplaceEmptyStrings<T>(List<T> list, string replacement)
{
    PropertyInfo[] properties = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);

    foreach (PropertyInfo p in properties)
    {
        // Only work with strings
        if (p.PropertyType != typeof(string)) { continue; }

        // If not writable then cannot null it; if not readable then cannot check it's value
        if (!p.CanWrite || !p.CanRead) { continue; }

        MethodInfo mget = p.GetGetMethod(false);
        MethodInfo mset = p.GetSetMethod(false);

        // Get and set methods have to be public
        if (mget == null) { continue; }
        if (mset == null) { continue; }

        foreach (T item in list)
        {
            if (string.IsNullOrEmpty((string)p.GetValue(item, null)))
            {
                p.SetValue(item, replacement, null);
            }
        }
    }
}

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