我通常在form/dialog上创建一个静态方法，我可以调用它。这将返回成功(ok -按钮)或失败，以及需要填写的值。

 public class ResultFromFrmMain {
     public DialogResult Result { get; set; }
     public string Field1 { get; set; }


 }

在表格上:

public static ResultFromFrmMain Execute() {
     using (var f = new frmMain()) {
          var result = new ResultFromFrmMain();
          result.Result = f.ShowDialog();
          if (result.Result == DialogResult.OK) {
             // fill other values
          }
          return result;
     }
}

呼唤你的形式;

public void MyEventToCallForm() {
   var result = frmMain.Execute();
   if (result.Result == DialogResult.OK) {
       myTextBox.Text = result.Field1; // or something like that
   }
}

在子表单上创建一些公共属性，如下所示

public string ReturnValue1 {get;set;} 
public string ReturnValue2 {get;set;}

然后在你的子表单ok按钮点击处理程序中设置这个

private void btnOk_Click(object sender,EventArgs e)
{
    this.ReturnValue1 = "Something";
    this.ReturnValue2 = DateTime.Now.ToString(); //example
    this.DialogResult = DialogResult.OK;
    this.Close();
}

然后在frmHireQuote表单中，当你打开子表单时

using (var form = new frmImportContact())
{
    var result = form.ShowDialog();
    if (result == DialogResult.OK)
    {
        string val = form.ReturnValue1;            //values preserved after close
        string dateString = form.ReturnValue2;
        //Do something here with these values

        //for example
        this.txtSomething.Text = val;
    }
}

另外，如果你想取消子表单，你可以在表单中添加一个按钮，并将其dialgresult设置为cancel，你也可以将表单的CancelButton属性设置为该按钮——这将使escape键取消表单。

首先，你必须在form2(child)中定义属性，你将在form2和form1(parent)中更新此属性:

 public string Response { get; set; }

 private void OkButton_Click(object sender, EventArgs e)
 {
    Response = "ok";
 }

 private void CancelButton_Click(object sender, EventArgs e)
 {
    Response = "Cancel";
 }

从form1(父)调用form2(子):

  using (Form2 formObject= new Form2() )
  {
     formObject.ShowDialog();

      string result = formObject.Response; 
      //to update response of form2 after saving in result
      formObject.Response="";

      // do what ever with result...
      MessageBox.Show("Response from form2: "+result); 
  }

我在设置值的表单中引发一个事件，并在需要处理值更改的表单中订阅该事件。

我通常在form/dialog上创建一个静态方法，我可以调用它。这将返回成功(ok -按钮)或失败，以及需要填写的值。

 public class ResultFromFrmMain {
     public DialogResult Result { get; set; }
     public string Field1 { get; set; }


 }

在表格上:

public static ResultFromFrmMain Execute() {
     using (var f = new frmMain()) {
          var result = new ResultFromFrmMain();
          result.Result = f.ShowDialog();
          if (result.Result == DialogResult.OK) {
             // fill other values
          }
          return result;
     }
}

呼唤你的形式;

public void MyEventToCallForm() {
   var result = frmMain.Execute();
   if (result.Result == DialogResult.OK) {
       myTextBox.Text = result.Field1; // or something like that
   }
}

委托是将数据从一个表单发送到另一个表单的最佳选择。

public partial class frmImportContact : Form
{
     public delegate void callback_data(string someData);
    public event callback_data getData_CallBack;

    private void button_Click(object sender, EventArgs e)
    {
      string myData = "Top Secret Data To Share";
      getData_CallBack(myData);
    }

}

public partial class frmHireQuote : Form
{
     private void Button_Click(object sender, EventArgs e)
    {

      frmImportContact obj = new frmImportContact();
      obj.getData_CallBack += getData;
    }

    private void getData(string someData)
    {
         MessageBox.Show("someData");
    }
}