请帮我看看是哪里有问题,该如何改正??

Question

c# public void tiqu(){  string finder = "1234567890";}private void persGSMToolStripMenuItem_Click(object sender, EventArgs e){tiqu();richTextBox1.Text = richTextBox1.Text.Replace(finder, "PersGSM");}

Answer 1

你这么编码，编译器不报错？
public String tiqu()
{  
string finder = "1234567890";
return finder;
}
private void persGSMToolStripMenuItem_Click(object sender, EventArgs e)
{
string finder =tiqu();
richTextBox1.Text = richTextBox1.Text.Replace(finder, "PersGSM");

} 

Answer 2

public void tiqu()
{  
string finder = "1234567890";
}
finder是一个局部变量，当这个函数执行完毕的时候，finder已经释放了，在内存中已经不存在了。
可以修改为
public string tiqu()
{  
string finder = "1234567890";
return finder;
}
private void persGSMToolStripMenuItem_Click(object sender, EventArgs e)
{
string fineder = tiqu();
richTextBox1.Text = richTextBox1.Text.Replace(finder, "PersGSM");

}