c# 如何从类中返回值？
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c# how can return value from class?
提问by deleted
I have class !
我有课 ！
class Reg_v_no_string
{
public static string key_place = "";
public static string key = "";
public static string value = "";
public string reg_value(string key_place, string key)
{
string value = string.Empty;
RegistryKey klase = Registry.CurrentUser;
klase = klase.OpenSubKey(key_place);
value = klase.GetValue(key).ToString();
klase.Close();
return value;
}
}
and this returns blank message box. How can solve this problem !? Thanks !
这将返回空白消息框。怎么才能解决这个问题！？谢谢 ！
how can i return value from this class ?
我怎样才能从这个类返回值？
I tryed
我试过了
private void kryptonButton1_Click(object sender, EventArgs e)
{
Reg_v_no_string.key_place = @"Control Panel\Desktop";
Reg_v_no_string.key_place = "WheelScrollLines";
MessageBox.Show(Reg_v_no_string.value);
}
采纳答案by Brad Rem
You need to actually call the method:
您需要实际调用该方法：
private void kryptonButton1_Click(object sender, EventArgs e)
{
var value = reg_value(@"Control Panel\Desktop", "WheelScrollLines");
MessageBox.Show(value);
}
Also consider some changes to your class:
还要考虑对您的班级进行一些更改：
public static class Reg_v_no_string
{
public static string reg_value(string key_place, string key)
{
string value = string.Empty;
RegistryKey klase = Registry.CurrentUser;
// todo: add some error checking to make sure the key is opened, etc.
klase = klase.OpenSubKey(key_place);
value = klase.GetValue(key).ToString();
klase.Close();
return value;
}
}
And then when you call this staticclass it is like this:
然后当你调用这个static类时，它是这样的：
// you don't need to `new` this class if it is static:
var value = Reg_v_no_string.reg_value(@"Control Panel\Desktop", "WheelScrollLines");
Or, to keep it so that it is not static:
或者，保持它不是静态的：
public class Reg_v_no_string
{
public string reg_value(string key_place, string key)
{
string value = string.Empty;
RegistryKey klase = Registry.CurrentUser;
// todo: add some error checking to make sure the key is opened, etc.
klase = klase.OpenSubKey(key_place);
value = klase.GetValue(key).ToString();
klase.Close();
return value;
}
}
Then call it like this:
然后像这样调用它：
Reg_v_no_string obj = new Reg_v_no_string ();
var value = reg_value(@"Control Panel\Desktop", "WheelScrollLines");
回答by Alexei Levenkov
There is no code that calls reg_value.
没有调用reg_value.
As result you are getting default (also shared between instances) value of valuefield.
因此，您将获得value字段的默认值（也在实例之间共享）。
回答by Bishan
Reg_v_no_string.valueis not set yet.
You have to call reg_value(string key_place, string key)function that will return the value.
Reg_v_no_string.value尚未设置。
您必须调用reg_value(string key_place, string key)将返回值的函数。
