1.通過tag屬性傳輸，tag屬性是存儲與空間密切相關的數據。比如登陸界面的數據傳輸給主界面。

子窗體 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?主窗體

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定義一個類

namespace FrmLogin {public class User{public string UserName { set; get; }public string PassWorld { set; get; }} }

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子窗體.cs

private void buttonLogin_Click(object sender, EventArgs e){User user = new User();user.UserName = this.textBoxName.Text.Trim();user.PassWorld = this.textBoxPassWorld.Text;this.Tag = user;this.DialogResult = DialogResult.OK;}

父（主）窗體.cs

private void FormMain_Load(object sender, EventArgs e){FormLogin frm = new FormLogin();if (frm.ShowDialog() == DialogResult.OK){User user = frm.Tag as User;this.Text += string.Format("--歡迎您:{0}", user.UserName);}else{frm.Close();}}

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2.創建一個類，相當于創建了全局共享的靜態變量，然后大家都來訪問這個靜態變量。

全局類.cs

using System; using System.Collections.Generic; using System.Linq; using System.Text;namespace FrmLogin {public class ConText{public static User UserLogin = null;} }

子窗體.cs

private void buttonLogin_Click(object sender, EventArgs e){User user = new User();user.UserName = this.textBoxName.Text.Trim();user.PassWorld = this.textBoxPassWorld.Text;//this.Tag = user; ConText.UserLogin = user;this.DialogResult = DialogResult.OK;}

主窗體.cs

private void FormMain_Load(object sender, EventArgs e){FormLogin frm = new FormLogin();if (frm.ShowDialog() == DialogResult.OK){// User user = frm.Tag as User;User user = ConText.UserLogin;this.Text += string.Format("--歡迎您:{0}", user.UserName);}else{frm.Close();}}

3.利用子窗體tag屬性

子窗體.cs

private void buttonLogin_Click(object sender, EventArgs e){User user = new User();user.UserName = this.textBoxName.Text.Trim();user.PassWorld = this.textBoxPassWorld.Text;FormLogin main = this.Owner as FormLogin;if (main == null){MessageBox.Show("LOGIN窗體沒有Owner，請檢查代碼！！");}main.Tag = user;this.DialogResult = DialogResult.OK;}

父窗體.cs

private void FormMain_Load(object sender, EventArgs e){FormLogin frm = new FormLogin();if (frm.ShowDialog(this) == DialogResult.OK)//這兒一定要加this {User user = this.Tag as User;this.Text += string.Format("--歡迎您:{0}", user.UserName);}else{frm.Close();}}

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轉載于:https://www.cnblogs.com/youthshouting/p/4361036.html

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