今天做了个程序，里面有个函数处理传入的对象，需要的效果是函数中处理完对象后对象能被返回，结果对象返回null值；

开始程序如下：

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void DoPayInfo(PayInfoBean pinfo) {

pinfo = new PayInfoBean(); 

pinfo.ResultCode = "1";

pinfo.Msg = "test";

pinfo.Tips = "测试成功";

}

private void button1_Click(object sender, EventArgs e)

{

PayInfoBean pinfo = new PayInfoBean();

DoPayInfo(pinfo);

MessageBox.Show(pinfo.Msg);

}

}

public class PayInfoBean

{

private string resultCode;

private string msg;

private string tips;

public string Tips

{

get { return tips; }

set { tips = value; }

}

public string ResultCode

{

get { return resultCode; }

set { resultCode = value; }

}

public string Msg

{

get { return msg; }

set { msg = value; }

}

}

 

于是在网上各种找资料，终于解决问题。代码修改如下：

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void DoPayInfo(PayInfoBean pinfo) {

PayInfoBean newpinfo = new PayInfoBean(); 

newpinfo.ResultCode = "1";

newpinfo.Msg = "test";

newpinfo.Tips = "测试成功";

newpinfo.CopyProperty(pinfo); //复制对象引用到传入的对象中

}

private void button1_Click(object sender, EventArgs e)

{

PayInfoBean pinfo = new PayInfoBean();

DoPayInfo(pinfo);

MessageBox.Show(pinfo.Msg);

}

}

public class PayInfoBean

{

private string resultCode;

private string msg;

private string tips;

public void CopyProperty(PayInfoBean dest)

{

dest.ResultCode = resultCode;

dest.Msg = msg;

dest.Tips = tips;

}

public string Tips

{

get { return tips; }

set { tips = value; }

}

public string ResultCode

{

get { return resultCode; }

set { resultCode = value; }

}

public string Msg

{

get { return msg; }

set { msg = value; }

}

}

 

最后问题终于解决了，发现在函数中不能将传入的对象重新创建，如果重新创建对象，传入的对象指针就会改变；而我之所以必须用传入对象进行处理，是因为之前的函数早就存在，那个对象是后来加入的，为了不改变原来函数的返回值，所以必须用传入对象处理；

 

参考资料：http://www.cnblogs.com/lidabo/archive/2012/03/12/2392304.html