Win form碎知识点

窗体位于屏幕中心 strtposition
form前提下 acceptbutton canclebutton
Tabindex table键 不需要的设为0
MaximizeBox--false 最大框禁用
panle radiobutton 年级GropDownList
groupBox 容器 panl 面板 radiobutton放在Panle中，实现单选互斥
菜单项 toolstrip menustrip
menustrip一用于左上角，如文件，编辑...之类的；
ContextMenuStrip是你单击出来修改，删除，这样之类的

!!!!!!!!!!!!!!!ToolStrip 介个控件很实用，很实用！！！！！！！！！！！！！！！！！！！

DataTable dt = NewsBLL.GetNewsType();
DropDownList1.DataValueField = "NewID";
DropDownList1.DataTextField = "NewName";
DropDownList1.DataSource = dt;
DropDownList1.DataBind();
下拉框展示
public void GetGrade()
{
    Grade Gd = new Grade();
    GrideList.ValueMember = "ID";
    DataValueFiled = "ID";
    GrideList.DisplayMember = "name";
    DataTextField = "name";
    selectText = name
    selectvalue = ID
}

DataTable dt = TransBLL.ComBoxBLL.GetProList();
comboBox1.DataSource = dt;
DataRow dr = dt.NewRow();
dr["ProvinceName"] = "请选择";
dt.Rows.InsertAt(dr, 0);
comboBox1.ValueMember = "ProvinceName";
comboBox1.SelectedIndex = 0;

———————————

给DataGrview添加事件

selectionMode的值变成FullRowSelect
private void dataGridView1_Click(object sender, EventArgs e)
{
this.tBoxName.Text = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
this.tBoxGoodsStyle.Text = dataGridView1.SelectedRows[0].Cells[2].Value.ToString();

}

//获取点击行的ID

int ID = Convert.ToInt32(dataGridView1.SelectedRows[0].Cells[0].Value.ToString());
GG.GoodsID = ID;
int result = SaleBLL.GoodsMangerBLL.Update(GG);

要想出现那个删除的按钮，就是在控件中添加contextMenuStrip控件
！！！！！！！！！！！！

在datadriview中有一个contextMenuStrip属性，值指向contextMenuStrip1
private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
{}

由主窗体跳转到子窗体的时候，主窗体有一个ISMdiContainer属性设置为TRUE；！！！！！！！！！！！！！！！！！！

private void 添加货物ToolStripMenuItem_Click(object sender, EventArgs e)
{
    if(!ShowChildrenForm("AddGoods"))
    {
        AddGoods AG = new AddGoods(); //将要打开的窗体实例化
        AG.MdiParent = this; //要子窗体的父窗体设置为当前窗体
        AG.Show();
    }
}

/// <summary>

/// 防止子窗体重复出现
/// </summary>
/// <param name="ChildFormName">把子窗体的name传递过来</param>
/// <returns></returns>

private bool ShowChildrenForm(string ChildFormName)
{
    int i;
    for(i = 0; i < this.MdiChildren.Length; i++)
    {
        //判断子窗体是否已经打开
        if(this.MdiChildren[i].Name == ChildFormName)
        {
            //如果子窗体已经打开，设置子窗体位焦点
            this.MdiChildren[i].Activate();
            return true;
        }
    }
    return false;
}

弹出框的确定 取消

DialogResult dr = MessageBox.Show("确定要删除吗？", "删除", MessageBoxButtons.YesNoCancel);
if(dr == DialogResult.Yes)
{}
else
{
    return;
}
int ID = Convert.ToInt32(dataGridView1.SelectedRows[0].Cells[0].Value.ToString());

///选择dataGriview里的一行，传到修改里去，前提dataGriview的selectMode属性变成一行

/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void dataGridView1_Click(object sender, EventArgs e)
{
    this.tBoxBar.Text = dataGridView1.SelectedRows[0].Cells[1].Value.ToString();
    this.tBoxName.Text = dataGridView1.SelectedRows[0].Cells[2].Value.ToString();
    this.tBoxSize.Text = dataGridView1.SelectedRows[0].Cells[3].Value.ToString();
    this.CmbStyle.Text = dataGridView1.SelectedRows[0].Cells[4].Value.ToString();
    this.tBoxBuyIn.Text = dataGridView1.SelectedRows[0].Cells[5].Value.ToString();
    this.tBoxPiFa.Text = dataGridView1.SelectedRows[0].Cells[6].Value.ToString();
    this.tBoxLPrice.Text = dataGridView1.SelectedRows[0].Cells[7].Value.ToString();
    this.tBoxCurNum.Text = dataGridView1.SelectedRows[0].Cells[8].Value.ToString();
    this.tBoxNote.Text = dataGridView1.SelectedRows[0].Cells[9].Value.ToString();
    this.tBoxProduct.Text = dataGridView1.SelectedRows[0].Cells[10].Value.ToString();
}

------------------------------------------------字符串分割----------------------------------------------------------------------

private void button2_Click(object sender, EventArgs e)
{
    //循环输出所有字符
    string txtinput = textBox1.Text.Trim();
    foreach(char item in txtinput)
    {
        //MessageBox.Show(item.ToString());
    }
    for(int i = 0; i < txtinput.Length; i++)
    {
        MessageBox.Show(txtinput[i].ToString());
    }
}
private void button1_Click(object sender, EventArgs e)
{
    string txtinput = textBox1.Text.Trim();
    string[] str = txtinput.Split(','); //按照特定的符号进行分割
    foreach(string item in str)
    {
        // MessageBox.Show(item.ToString());
    }
    for(int i = 0; i < str.Length; i++)
    {
        MessageBox.Show(str[i]);
    }
}