一、编码思路

在父窗体使用Lambda表达式自定义事件赋给子窗体内定义的事件，通过在子窗体内调用事件实现传参

二、传递的参数

创建文件SomeUtility.cs，在类SomeUtility中声明结构ReturnStruct

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace EventTest{    public class SomeUtility    {        public struct ReturnStruct        {            public string sData1;            public string sData2;            public string sData3;            public ReturnStruct(string s1, string s2, string s3)            {                sData1 = s1;                sData2 = s2;                sData3 = s3;            }        }    }}

三、子窗体相关

窗体FormTip，里面有三个TextBox，单击确定会将三个TextBox的值传递到父窗体中

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace EventTest{    public partial class FormTip : Form    {        public class TEventArgs
    
      : EventArgs        {            public T Args            {                get;                private set;            }            public TEventArgs(T args)            {                this.Args = args;            }        }        [Browsable(false)]        internal event EventHandler
     
      
       > EventTest;        SomeUtility.ReturnStruct rs;        public SomeUtility.ReturnStruct GetReturnStruct()        {            return rs;        }        //构造函数1：无参数        public FormTip()        {            InitializeComponent();        }        //构造函数2：有一个ReturnStruct类型参数        public FormTip(SomeUtility.ReturnStruct r)        {            InitializeComponent();            this.rs.sData1 = r.sData1;            this.rs.sData2 = r.sData2;            this.rs.sData3 = r.sData3;        }        private void FormTip_Load(object sender, EventArgs e)        {            this.txtData1.Text = rs.sData1;            this.txtData2.Text = rs.sData2;            this.txtData3.Text = rs.sData3;        }        //单击“确定”按钮：调用事件EventTest        private void btnOK_Click(object sender, EventArgs e)        {            //调用事件EventTest            if (this.EventTest != null)            {                SomeUtility.ReturnStruct rs = new SomeUtility.ReturnStruct(                    this.txtData1.Text, this.txtData2.Text, this.txtData3.Text);                this.EventTest(this, new TEventArgs
       
        (rs));            }            //退出窗口            this.Close();        }        //单击“取消”按钮：直接退出        private void btnCancel_Click(object sender, EventArgs e)        {            this.Close();        }    }}
       
      
     
    

四、父窗体相关

窗体FormMain，单击按钮btnTest打开子窗体，并在单击子窗体的“确定”按钮后根据子窗体内设置的值更新txtResult中的文本内容

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace EventTest{    public partial class FormMain : Form    {        public FormMain()        {            InitializeComponent();        }        private void FormMain_Load(object sender, EventArgs e)        {            this.txtResult.Text = "1:- 2:- 3:-";        }        private void btnTest_Click(object sender, EventArgs e)        {            SomeUtility.ReturnStruct rsTest =                 new SomeUtility.ReturnStruct("Data1", "Data2", "Data3");            FormTip frmTip = new FormTip(rsTest);            frmTip.EventTest += (obj, args) =>            {                SomeUtility.ReturnStruct rsTemp = frmTip.GetReturnStruct();                rsTest.sData1 = args.Args.sData1;                rsTest.sData2 = args.Args.sData2;                rsTest.sData3 = args.Args.sData3;                this.txtResult.Text = string.Format("1:{0} 2:{1} 3:{2}",                    rsTest.sData1, rsTest.sData2, rsTest.sData3);                MessageBox.Show("赋值成功");            };            frmTip.ShowDialog();        }    }}

五、运行示例

1）打开父窗体FormMain

2）打开子窗体FormTip，输入三个值

3）将三个值传回父窗体FormMain

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