C＃：如何让所有的公共（get和set）字符串类型的属性 [英] C#: How to get all public (both get and set) string properties of a type

问题描述

我试图做出将通过通用对象的列表，并取代其类型的所有属性字符串要么是无效的方法或空用的替代品。

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.

如何是一个很好的办法做到这一点？

How is a good way to do this?

我有这样的... ...壳至今：

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，如何找到属于一个类型的所有属性：

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

• 键入字符串


• 的公共 GET



• 有市民设置

---

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; }
}

以下不工作：

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

如果我打印出来的那些属性我到那里的名，我得到：

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

PublicPublic
  公私
  PrivatePublic

PublicPublic PublicPrivate PrivatePublic

在换句话说，我得到两个属性太多。

In other words, I get two properties too much.

---

的注意：这或许可以以更好的方式...使用嵌套的foreach和反思，并都在这里做...但如果​​你有任何伟大的替代的想法，请让我知道因为我想学！的

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code重写。不使用LINQ，也无功。

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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