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   源码介绍

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

namespace Login.View
{
    public partial class MainFrm : Form
    {
        private int childFormNumber = 0;

        public MainFrm()
        {
            InitializeComponent();
        }

        private void ShowNewForm(object sender, EventArgs e)
        {
            // 创建此子窗体的一个新实例。
            Form childForm = new Form();
            // 在显示该窗体前使其成为此 MDI 窗体的子窗体。
            childForm.MdiParent = this;
            childForm.Text = "窗口"   childFormNumber  ;
            childForm.Show();
        }

        private void OpenFile(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
            openFileDialog.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";
            if (openFileDialog.ShowDialog(this) == DialogResult.OK)
            {
                string FileName = openFileDialog.FileName;
                // TODO: 在此处添加打开文件的代码。
            }
        }

        private void SaveAsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
            saveFileDialog.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";
            if (saveFileDialog.ShowDialog(this) == DialogResult.OK)
            {
                string FileName = saveFileDialog.FileName;
                // TODO: 在此处添加代码，将窗体的当前内容保存到一个文件中。
            }
        }

        private void ExitToolsStripMenuItem_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void CutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            // TODO: 使用 System.Windows.Forms.Clipboard 将所选的文本或图像插入到剪贴板
        }

        private void CopyToolStripMenuItem_Click(object sender, EventArgs e)
        {
            // TODO: 使用 System.Windows.Forms.Clipboard 将所选的文本或图像插入到剪贴板
        }

        private void PasteToolStripMenuItem_Click(object sender, EventArgs e)
        {
            // TODO: 使用 System.Windows.Forms.Clipboard.GetText() 或 System.Windows.Forms.GetData 从剪贴板中检索信息。
        }

        private void StatusBarToolStripMenuItem_Click(object sender, EventArgs e)
        {
            statusStrip.Visible = statusBarToolStripMenuItem.Checked;
        }

        private void CascadeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.Cascade);
        }

        private void TileVerticleToolStripMenuItem_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.TileVertical);
        }

        private void TileHorizontalToolStripMenuItem_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.TileHorizontal);
        }

        private void ArrangeIconsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.ArrangeIcons);
        }

        private void CloseAllToolStripMenuItem_Click(object sender, EventArgs e)
        {
            foreach (Form childForm in MdiChildren)
            {
                childForm.Close();
            }
        }

        private void MainFrm_Load(object sender, EventArgs e)
        {
            
            Loginfrm lf = new Loginfrm();
            lf.Show();
            lf.MdiParent = this;
            this.menuStrip.Enabled = false;
        }

        private void optionsToolStripMenuItem_Click(object sender, EventArgs e)
        {

        }

    }
}