从 C# 中的另一个隐藏窗体控制窗体

Question

我正在处理一个向服务器发送登录请求的客户端，如果它被接受，主窗口将被隐藏，用户将开始使用名为 user_form 的表单 2 ...并且有 3 个按钮可用于user_form 上的用户（注销 - 退出 - 隐藏）

我想从已经隐藏的主窗口中控制它们,,,

这是我正在使用的主要形式的代码......但它没有按我想要的方式工作。

switch (client.LoginInfo.Limited)
{
    case true:
        this.Hide();
        User_Form LF = new User_Form(client);
        LF.AdminControlIsVisible = false;
        DialogResult dr = LF.ShowDialog(this);
        if (dr == System.Windows.Forms.DialogResult.Cancel)
        {
            //logout
        }
        else if (dr == System.Windows.Forms.DialogResult.OK)
        {
            if (client != null)
            {
                //hide
            }
            else
            {
                UpdateSystemMessage("No response from the server !!");
            }
            return;
        }
        break;
    case false:
        User_Form LF = new User_Form(client);
        LF.AdminControlIsVisible = false;
        DialogResult dr = LF.ShowDialog(this);
        this.Visible = false;
        if (dr == System.Windows.Forms.DialogResult.Cancel)
        {
            //logout
        }
        else if (dr == System.Windows.Forms.DialogResult.OK)
        {
            if (client != null)
            {
                //hide
            }
            else
            {
                UpdateSystemMessage("No response from the server !!");
            }
            return;
        }
        break;
}

有什么办法吗？

Answer 1

我通过添加一个新线程而不是主线程来运行 .net 套接字来修复它。

Answer 2

如果我了解您要做什么，一种简单的方法是您所控制的表单具有公共功能，当被调用时会影响表单。然后，您需要将这些表单的实例传递给控制的表单（通常在构造函数中）。然后，您可以从控制器表单中调用这些函数，从而影响受控表单。

例子：

public class ControlledForm : Form 
{
    //...        

    //This founction will affect the form
    public void DoSomething(int Params)
    {
    //Affect Form
    }

    private void SomethingEventHandler() //function that calls the new form and hides this one
    {
        //Give the construction this (the instance of the form) in parameter
        ControllerForm newControllerForm = new ControllerForm(this);
        newControllerForm.Show();
        this.Hide();
    }
}

public class ControllerForm : Form
{
    //Constructor that receives the instance of the controlled form in parameter
    public ControllerForm(ControlledForm CF)
    {
        _ControlledForm = CF;
        InitializeComponents();
    }

    private ControlledForm _ControlledForm;

    private void SomethingElseEventHandler() //Function that modifies the controlled form
    {
        //This will effectively affect the form
        _ControlledForm.DoSomething(12);
    }    
}

如果这能回答你的问题，我不知道，但自从我偶然发现这个问题以来，我就是这样解决的。

Answer 3

如果你只是想很好地控制显示在一个表单上的东西，从另一个表单，也许这可以帮助你......（你没有提供相关代码来给出一个使用你的项目的例子，所以我只是做了2 个表单可以相互更改背景颜色，而无需过多地“了解”对方，通过使用一个保存模型数据并由两个表单共享的对象...）

Form1.cs：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        MyModelClass model = new MyModelClass();
        public Form1()
        {
            InitializeComponent();
            model.AnotherColor = model.AColor = System.Drawing.Color.FromKnownColor(KnownColor.Control);
            bindingSource1.DataSource = model;
            this.DataBindings.Add("BackColor", bindingSource1, "AColor");
            this.DataBindings.Add("Visible", bindingSource1, "ABool");
            new Form2(model).Show();
        }

        private BindingSource bindingSource1;
        private Button button1;
        private Button button2;
        private Button button3;
        private Button button4;
        private Button button5;

        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.bindingSource1 = new System.Windows.Forms.BindingSource(this.components);
            this.button1 = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            this.button3 = new System.Windows.Forms.Button();
            this.button4 = new System.Windows.Forms.Button();
            this.button5 = new System.Windows.Forms.Button();
            ((System.ComponentModel.ISupportInitialize)(this.bindingSource1)).BeginInit();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(12, 12);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(127, 23);
            this.button1.TabIndex = 0;
            this.button1.Text = "Form2 -> green";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // button2
            // 
            this.button2.Location = new System.Drawing.Point(12, 41);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(127, 23);
            this.button2.TabIndex = 1;
            this.button2.Text = "Form2 -> red";
            this.button2.UseVisualStyleBackColor = true;
            this.button2.Click += new System.EventHandler(this.button2_Click);
            // 
            // button3
            // 
            this.button3.Location = new System.Drawing.Point(12, 70);
            this.button3.Name = "button3";
            this.button3.Size = new System.Drawing.Size(127, 23);
            this.button3.TabIndex = 2;
            this.button3.Text = "Form2 -> Visible";
            this.button3.UseVisualStyleBackColor = true;
            this.button3.Click += new System.EventHandler(this.button3_Click);
            // 
            // button4
            // 
            this.button4.Location = new System.Drawing.Point(12, 99);
            this.button4.Name = "button4";
            this.button4.Size = new System.Drawing.Size(127, 23);
            this.button4.TabIndex = 3;
            this.button4.Text = "Form2 -> Invisible";
            this.button4.UseVisualStyleBackColor = true;
            this.button4.Click += new System.EventHandler(this.button4_Click);
            // 
            // button5
            // 
            this.button5.Location = new System.Drawing.Point(46, 159);
            this.button5.Name = "button5";
            this.button5.Size = new System.Drawing.Size(106, 42);
            this.button5.TabIndex = 4;
            this.button5.Text = "some important form1 button";
            this.button5.UseVisualStyleBackColor = true;
            this.button5.Click += new System.EventHandler(this.button5_Click);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(284, 262);
            this.Controls.Add(this.button5);
            this.Controls.Add(this.button4);
            this.Controls.Add(this.button3);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.button1);
            this.Name = "Form1";
            this.Text = "Form1";
            ((System.ComponentModel.ISupportInitialize)(this.bindingSource1)).EndInit();
            this.ResumeLayout(false);

        }

        #endregion

        private void button1_Click(object sender, EventArgs e)
        {
            model.AnotherColor = Color.Green;
            model.doSomething();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            model.AnotherColor = Color.Red;
            model.doSomething();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            model.AnotherBool = true;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            model.AnotherBool = false;
        }

        private void button5_Click(object sender, EventArgs e)
        {
            model.someImportantMethod();
        }
    }
}

Form2.cs：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form2 : Form
    {
        MyModelClass model;
        private Button button4;
        private Button button3;
        private Button button5;
        int callCounter = 0;
        public Form2(MyModelClass model)
        {
            InitializeComponent();
            this.model = model;
            bindingSource1.DataSource = model;
            DataBindings.Add("BackColor", bindingSource1, "AnotherColor");
            this.DataBindings.Add("Visible", bindingSource1, "AnotherBool");

            model.PropertyChanged += new PropertyChangedEventHandler(model_PropertyChanged);
        }

        void model_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            label1.Text = String.Format("PropertyChanged was called {0} times.", ++callCounter);
        }

        private BindingSource bindingSource1;
        private Button button2;
        private Button button1;
        private Label label1;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.bindingSource1 = new System.Windows.Forms.BindingSource(this.components);
            this.button2 = new System.Windows.Forms.Button();
            this.button1 = new System.Windows.Forms.Button();
            this.label1 = new System.Windows.Forms.Label();
            this.button4 = new System.Windows.Forms.Button();
            this.button3 = new System.Windows.Forms.Button();
            this.button5 = new System.Windows.Forms.Button();
            ((System.ComponentModel.ISupportInitialize)(this.bindingSource1)).BeginInit();
            this.SuspendLayout();
            // 
            // button2
            // 
            this.button2.Location = new System.Drawing.Point(18, 41);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(127, 23);
            this.button2.TabIndex = 3;
            this.button2.Text = "Form1 -> red";
            this.button2.UseVisualStyleBackColor = true;
            this.button2.Click += new System.EventHandler(this.button2_Click);
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(18, 12);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(127, 23);
            this.button1.TabIndex = 2;
            this.button1.Text = "Form1 -> green";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(15, 231);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(181, 13);
            this.label1.TabIndex = 4;
            this.label1.Text = "PropertyChanged was called 0 times.";
            // 
            // button4
            // 
            this.button4.Location = new System.Drawing.Point(18, 99);
            this.button4.Name = "button4";
            this.button4.Size = new System.Drawing.Size(127, 23);
            this.button4.TabIndex = 6;
            this.button4.Text = "Form1 -> Invisible";
            this.button4.UseVisualStyleBackColor = true;
            this.button4.Click += new System.EventHandler(this.button4_Click);
            // 
            // button3
            // 
            this.button3.Location = new System.Drawing.Point(18, 70);
            this.button3.Name = "button3";
            this.button3.Size = new System.Drawing.Size(127, 23);
            this.button3.TabIndex = 5;
            this.button3.Text = "Form1 -> Visible";
            this.button3.UseVisualStyleBackColor = true;
            this.button3.Click += new System.EventHandler(this.button3_Click);
            // 
            // button5
            // 
            this.button5.Location = new System.Drawing.Point(154, 164);
            this.button5.Name = "button5";
            this.button5.Size = new System.Drawing.Size(94, 40);
            this.button5.TabIndex = 7;
            this.button5.Text = "some less important button";
            this.button5.UseVisualStyleBackColor = true;
            this.button5.Click += new System.EventHandler(this.button5_Click);
            // 
            // Form2
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(284, 262);
            this.Controls.Add(this.button5);
            this.Controls.Add(this.button4);
            this.Controls.Add(this.button3);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.button1);
            this.Name = "Form2";
            this.Text = "Form2";
            ((System.ComponentModel.ISupportInitialize)(this.bindingSource1)).EndInit();
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private void button1_Click(object sender, EventArgs e)
        {
            model.AColor = Color.Green;
            model.doSomething();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            model.AColor = Color.Red;
            model.doSomething();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            model.ABool = true;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            model.ABool = false;
        }

        private void button5_Click(object sender, EventArgs e)
        {
            MessageBox.Show("some less important button was clicked ... \nnow calling the same method that's called from form1's important button");
            model.someImportantMethod();
        }
    }
}

MyModelClass.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WindowsFormsApplication1
{
    public class MyModelClass : System.ComponentModel.INotifyPropertyChanged
    {
        private System.Drawing.Color _aColor;

        public System.Drawing.Color AColor
        {
            get { return _aColor; }
            set { 
                _aColor = value;
                fireChanged("AColor");
            }
        }

        private System.Drawing.Color _anotherColor;

        public System.Drawing.Color AnotherColor
        {
            get { return _anotherColor; }
            set { 
                _anotherColor = value;
                fireChanged("AnotherColor");
            }
        }

        private bool _aBool = true;

        public bool ABool
        {
            get { return _aBool; }
            set
            {
                _aBool = value;
                fireChanged("ABool");
            }
        }

        private bool _anotherBool = true;

        public bool AnotherBool
        {
            get { return _anotherBool; }
            set
            {
                _anotherBool = value;
                fireChanged("AnotherBool");
            }
        }


        public void doSomething() 
        {
            //some function here
            System.Windows.Forms.MessageBox.Show("doSomething() was called"); 
        }

        private void fireChanged(string name)
        {
            var evth = PropertyChanged;
            if (evth != null)
                evth(this, new System.ComponentModel.PropertyChangedEventArgs(name));
        }

        public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;

        internal void someImportantMethod()
        {
            System.Windows.Forms.MessageBox.Show("some important mehod, that is usually called from a button in from1");
        }
    }
}

---

编辑： 如果您想在表单上触发其他操作，您还可以在模型类上定义自己的事件并触发它们，就像PropertyChanged

使用您的事件的类应该简单地注册一个事件处理程序，就像这里的 Form2 用于更新调用计数器一样

---

edit2：更改示例代码以显示隐藏表单并将代码从 button_click 处理程序重新定位到单独的方法