.NET反思：如何获得性能上的部分类定义 [英] .NET reflection: how to get properties defined on partial class

问题描述

我用的是.NET实体框架。我想从一个EntityObject复制属性到另一个。但System.Type.GetProperties（）似乎并没有返回的部分类中定义的属性。

I use the .NET Entity Framework. I want to copy properties from one EntityObject to another. But System.Type.GetProperties() does not seem to return the properties defined on the partial class.

code：

在XXX.edmx /由Visual Studio生成XXX.Designer.cs，我有类MyTable的：

In XXX.edmx/ XXX.Designer.cs generated by Visual Studio, I have class MyTable:

public partial class MyTable: EntityObject{..}

我想添加一些属性MyTable的课，所以我想补充文件XXX.Manual.cs：

I want to add some properties to MyTable class, so I add file XXX.Manual.cs:

public partial class MyTable: EntityObject{
    public string myProp{get;set;}
}

但 myTableObj.GetType（）。GetProperties中（）不包含myProp！

But myTableObj.GetType().GetProperties() does not contain myProp!!!

怎样才能使用反射myProp？

How can I get myProp using reflection?

我要评论亚历克斯的答案，但不知道为什么code部分没有格式化。

I want to comment to Alex answer but don't know why the code section is not formated.

是的，这是很奇怪的。 我用这个code从实体复制的属性到另一个OBJ：

Yes, this is very strange. I use this code to copy properties from Entity to another obj:

public static void CopyTo(this EntityObject Entity, EntityObject another){
    var Type = Entity.GetType();
    foreach (var Property in Type.GetProperties()){
        ...
        Property.SetValue(another, Property.GetValue(Entity, null), null);
    }
}
//in some other place:
myTableObj.CopyTo(anotherTableObj);

中职高myTableObj和放大器; anotherTableObj的类型的MyTable的。

Of couse myTableObj & anotherTableObj is of type MyTable.

在调试到CopyTo方法，VS表明实体放大器;另一种类型是MyTable的＆放大器;我可以看到Entity.myProp，another.myProp

When debug into the CopyTo method, VS show that Entity & another is of type MyTable & I can see Entity.myProp, another.myProp

但物业增值的foreach语句根本就没有循环myProp财产！

But the Property var in foreach statement simply don't loop to myProp property!

不好意思。在code以上（CopyTo方法）是从<副本href="http://stackoverflow.com/questions/2185155/cloning-data-on-entity-framework/5560756#5560756">diamandiev's回答另一个问题

Sorry. The code above (CopyTo method) is copy from diamandiev's answer for another question

但他的code是错误的：中断语句都必须由替换继续：D

But his code is wrong: The "break" statement must be replace by "continue" :D

推荐答案

首先局部类是多么源$ C ​​$ c是分裂。它不影响已编译组件

First of all partial classes is just how source code is split. It does not affect the compiled assembly.

有可能是你没有看到 myProp 属性，因为 myTableObj 的类型是不是的MyTable 。

It is likely that you don't see myProp property because myTableObj is not of type MyTable.

试试这个：

var property = typeof(MyTable).GetProperty("myProp");

刚查：

EntityObject x = new MyTable();

var property1 = typeof(MyTable).GetProperty("myProp");
var property2 = x.GetType().GetProperty("myProp");

两个 property1 和 property2 返回的属性。

想你的code，它经过小改款的工作：

Tried your code, it worked after small modification:

public static void CopyTo(EntityObject fromEntity, EntityObject toEntity)
{
    foreach (var property in fromEntity.GetType().GetProperties())
    {
        if (property.GetSetMethod() == null)
            continue;
        var value = property.GetValue(fromEntity, null);
        property.SetValue(toEntity, value, null);
    }
}

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