[求助]初学者问题 C#WINFORM...请各位大侠们帮帮忙! 谢谢

Question

1.\ C# WINFORM
        
        RegisterInfo formRegisterInfo = null;        private void buttonX1_Click(object sender, EventArgs e)
        {
            if (formRegisterInfo == null)
            {
                formRegisterInfo = new RegisterInfo();
                formRegisterInfo.TopLevel = false;
                formRegisterInfo.Parent = groupPanel;
                formRegisterInfo.BringToFront();
                formRegisterInfo.Show();
            }
            else
            {
                if (formRegisterInfo.WindowState == FormWindowState.Minimized)
                    formRegisterInfo.WindowState = FormWindowState.Normal;
                formRegisterInfo.BringToFront();
            }
        }
点了buttonX1在grouppanel出现RegisterInfo窗口如果把窗口关了在点按钮就没效果了 怎么办?是不是要在FormClosing事件写些什么?应该怎么写啊?...就是想实现点按钮最多出现同一个窗体2.ShowDialog()出一个窗体 上一个按钮点击后要希望执行上面的代码提示这个错误: 应该怎么办?
非静态的字段、方法或属性“CSMS.MainForm.groupPanel”要求对象引用请大家多多帮忙初学者 谢谢`~!

Answer 1

else 
            { 
                if (formRegisterInfo.WindowState == FormWindowState.Minimized) 
                    formRegisterInfo.WindowState = FormWindowState.Normal; 
                formRegisterInfo.Show();
                formRegisterInfo.BringToFront(); 
            } 

Answer 2

formRegisterInfo.Parent = this.groupPanel1; 
上面的groupPanel1是你窗体上的groupPanel实例

Answer 3

况且这样写的话formRegisterInfo != null 它就会执行ELSE里的类容...如果反复点按钮就会出现多个相同的拉

Answer 4

改成这个样子：        private void buttonX1_Click(object sender, EventArgs e) 
        { 
            if (formRegisterInfo == null) 
            { 
                formRegisterInfo = new RegisterInfo(); 
                formRegisterInfo.TopLevel = false; 
                formRegisterInfo.Parent = groupPanel; 
             } 
               formRegisterInfo.BringToFront(); 
               formRegisterInfo.Show(); 
               formRegisterInfo.WindowState = FormWindowState.Normal; 

Answer 5

7楼的 那样写如果不为空 点按钮会反复SHOW出同一个窗体啊.在事件外创建一个RegisterInfo对象formRegisterInfo = null//并为空
点按钮判断formRegisterInfo是否为空
为空就实例化 并显示这个窗口.
下面的ELSE只是判断他在groupPanel是不是最小化 是的话就变大前端显示.好像是:对象formRegisterInfo实例化后就不为空了
现在在关闭这个窗口让对象formRegisterInfo重新变为空就可以解决这个问题但是不知道怎么写代码请高手指点!

Answer 6

你不是要Show同一个窗体吗？改成这样看看：       private void buttonX1_Click(object sender, EventArgs e) 
        { 
            if (formRegisterInfo == null) 
            { 
                formRegisterInfo = new RegisterInfo(); 
                formRegisterInfo.TopLevel = false; 
                formRegisterInfo.Parent = groupPanel; 
                formRegisterInfo.Closing+=new CancelEventHandler(formRegisterInfo_Closing);
             } 
               formRegisterInfo.BringToFront(); 
               formRegisterInfo.Show(); 
               formRegisterInfo.WindowState = FormWindowState.Normal;          }
     ...
       private void formRegisterInfo_Closing(object sender,CancelEventArgs)
       {
          formRegisterInfo=null;
       }

Answer 7

formRegisterInfo_Closing      private void formRegisterInfo_Closing(object sender,CancelEventArgs)
       {
          formRegisterInfo=null;
       }提示上下文不存在这两个

Answer 8

        public static RegisterInfo formRegisterInfo = null;
        private void buttonX1_Click(object sender, EventArgs e)
        {
            
            if (formRegisterInfo == null)
            {
                formRegisterInfo = new RegisterInfo();
                formRegisterInfo.TopLevel = false;
                formRegisterInfo.Parent = groupPanel1;
                formRegisterInfo.BringToFront();
                formRegisterInfo.Show();
            }
            else
            {
                if(formRegisterInfo.WindowState == FormWindowState.Minimized)
                    formRegisterInfo.WindowState = FormWindowState.Normal;
                    
                formRegisterInfo.BringToFront();
                
             }
        }        private void RegisterInfo_FormClosing(object sender, FormClosingEventArgs e)
        {
           MainForm.formRegisterInfo= null;        
        }这样终于实现了 谢谢~~