对象引用未设置为对象的实例 - 请使用clarfy [英] Object reference not set to an instance of an object - pls clarfy

问题描述

大家好，

当我运行我的代码时，我正在gging null引用错误。请告诉我如何纠正这个错误。





我的代码：xaml.cs

hi all,
when i run my code, i am ggeting null reference error. pls clarify me how to rectify this error.


my code : xaml.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Windows;
using System.Runtime.InteropServices;

namespace Mosaicimage
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {

        [DllImport("regkeydll.dll")]
        public static extern int regmethod(string regname);
        private void Application_Startup(object sender, StartupEventArgs e)
        {
            bool security = RegKeyDLL.SetRegistry.regmethod("Mosaic");

            if (security)
            {
                Window1 mainWindow = new Window1();
                mainWindow.Show();
            }
        }
    }
}

这是一行，我收到此错误。



bool security = RegKeyDLL.SetRegistry.regmethod（Mosaic）;



请告诉我如何纠正...



提前谢谢。

this is the line, where i am getting this error.

bool security = RegKeyDLL.SetRegistry.regmethod("Mosaic");

please clarify me how to rectify...

thanks in advance.

推荐答案

好吧，看看：你导入了这个功能来自C dll（至少，这是DllImport声明所说的）。当你想要执行那个方法时，你只需要调用它：

Well, look: you import that function from a C dll (at least, that''s what the DllImport statement says). When you want to execute that method, you just call it:

int security = regmethod("Mosaic");

另请注意，返回值根据您的声明为int，而不是bool。

Also note that the return value is int according to your declaration, not bool.

请参阅这里 [ ^ ] for如何在C＃中设置密钥。

See here[^] for how to set keys in C#.

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