# WinFormTransferValue

**Repository Path**: hdlbdyr/win-form-transfer-value

## Basic Information

- **Project Name**: WinFormTransferValue
- **Description**: winform窗体传值案例
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 1
- **Forks**: 0
- **Created**: 2024-09-12
- **Last Updated**: 2024-11-06

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# 窗体传值解析



> 父传子方式一

构造函数传值/属性传值

这个就不解释了,没啥可说的

> 父传子方式二

委托事件传值

```C#

// 也可以使用框架自带事件 EventHandler<DataEventArgs>  public event EventHandler<DataEventArgs> DataTransfer;
// DataEventArgs 是继承自 EventArgs 的一个类 
// PS:按理说 应该随便定义一个类就行(只是传值的情况下)

// 核心代码
// 父窗体代码
 public delegate void CustomParentTransferChildrenDelegate<in T>(object sender, T e);
 public event CustomParentTransferChildrenDelegate<DataEventArgs> CustomParentTransferChildrenEvent;

 private void btnCustom_Click(object sender, EventArgs e)
 {
     if (string.IsNullOrWhiteSpace(this.txtParent.Text))
     {
         MessageBox.Show("请输入Parent值", "提示");
         return;
     }
     // 将传递的值给到事件
     CustomParentTransferChildrenEvent.Invoke(this, new DataEventArgs(this.txtParent.Text));
     // CustomParentTransferChildrenEvent(this, new DataEventArgs(this.txtParent.Text));  和上面这句代码是等价的
 }

// 核心代码
// 子窗体代码
  private void FrmChildren_Load(object? sender, EventArgs e)
  {
      this.txtParent.Text = this.Message;
      var parentFrm = (FrmMain)this.Owner;
      parentFrm.DataTransfer += ParentFrm_DataTransfer; // 框架自带 EventHandler
      // 子窗体实现事件方法
      parentFrm.CustomParentTransferChildrenEvent += ParentFrm_CustomTransferData; // 自定义事件
  }

   /// <summary>
   /// 自定义事件
   /// </summary>
   /// <param name="sender"></param>
   /// <param name="e"></param>
   private void ParentFrm_CustomTransferData(object sender, DataEventArgs e)
   {
       this.txtParent.Text = e.Data;
   }
```





> 子传父

```C#
// 核心代码
// 子窗体代码
 public delegate void CustomChildrenTransferParent<T>(T data);
 public event CustomChildrenTransferParent<DataEventArgs> CustomChildrenTransferParentEvent;

 private void btn_Transfer_Value_Click(object sender, EventArgs e)
 {
     string input = this.txtChildren.Text;
     //  将传递的值给到事件
     CustomChildrenTransferParentEvent(new DataEventArgs(input));
 }

// 核心代码
// 父窗体代码
private void btnOpenChildren_Click(object sender, EventArgs e)
{
    FrmChildren frm = new FrmChildren();
    // 父窗体实现子窗体事件方法
    frm.CustomChildrenTransferParentEvent += Frm_CustomChildrenTransferParentEvent; // 子窗体事件父窗体实现(事件委托)
    frm.Show();
}

 // 子窗体事件父窗体实现(事件委托)
 private void Frm_CustomChildrenTransferParentEvent(DataEventArgs data)
 {
     this.txtChildren.Text = data.Data;
 }
```