找出某個namespace下所有類別裡面有哪些類別的哪些屬性不是單純的get set | find out class that have not simple getter setter property in specific name space

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需求描述

因為要做重構，需要找出有哪些邏輯是藏在 DTO 裡面的，
但 DTO 類別檔又很多，不想一個個找
所以就想寫個 console 程式來撈

做法

首先把要撈的 DLL 跟他相依的 DLL 都複製到要執行的排程執行檔輸出資料夾(通常是 bin\debug)

以下程式碼:

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public class Worker {
    public void DoWork () {
        System.Reflection.Assembly service = Assembly.LoadFile (@"<你要找的namespace所在的dll的絕對路徑>.dll");
        Type[] typelist = service.GetTypes ();
        //你的類別名稱的特徵，例如找DTO就結尾是DTO
        var nameHaveDtoTypes = typelist.Where (x => x.Name.ToUpper ().EndsWith ("DTO"));
        foreach (var typeitem in nameHaveDtoTypes) {
            if (typeitem.GetProperties ().Any (prop => !MightBeCouldBeMaybeAutoGeneratedInstanceProperty (prop))) {
                //印到畫面跟輸出視窗
                foreach (var prop in typeitem.GetProperties ().Where (prop => !MightBeCouldBeMaybeAutoGeneratedInstanceProperty (prop))) {
                    Console.WriteLine ($"{typeitem.Name},{prop.Name}");
                    System.Diagnostics.Debug.WriteLine ($"{typeitem.Name},{prop.Name}");
                }
            }
        }
    }
    public bool MightBeCouldBeMaybeAutoGeneratedInstanceProperty (PropertyInfo info) {
        bool mightBe = info.GetGetMethod ().GetCustomAttributes (typeof (CompilerGeneratedAttribute), true).Any ();
        if (!mightBe) {
            return false;
        }
        bool maybe = info.DeclaringType
            .GetFields (BindingFlags.NonPublic | BindingFlags.Instance)
            .Where (f => f.Name.Contains (info.Name))
            .Where (f => f.Name.Contains ("BackingField"))
            .Where (f => f.GetCustomAttributes (typeof (CompilerGeneratedAttribute), true).Any ())
            .Any ();
        return maybe;
    }
}

參考:
1.LINE 群大神指點關鍵字CompilerGeneratedAttribute
這個是指在編譯成 DLL 時，單純 getter setter 的屬性上面會有這個 tag
https://msdn.microsoft.com/en-us/library/system.runtime.compilerservices.compilergeneratedattribute.aspx

2.How to find out if a property is an auto-implemented property with reflection?
https://stackoverflow.com/questions/2210309/how-to-find-out-if-a-property-is-an-auto-implemented-property-with-reflection?lq=1