C# WinForm dataGridView 技巧小结

1.不显示第一个空白列
RowHeaderVisible属性设置为false

2.点击cell选取整行
SelectinModel属性FullRowSelect
RowSelectinModel属性设置
或用CellClick事件也可以         //整行选取
        private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            //e.RowIndex > -1否则点击header也是叫一列
            if (dataGridView1.Rows.Count > 0 && e.RowIndex > -1)
            {
                //MessageBox.Show(e.RowIndex.ToString());
                dataGridView1.Rows[e.RowIndex].Selected = true;
            }
        }
3.添加按钮图片按钮列事件
按钮上要显示文字要设置Text属性。默认是没有值的。但还没搞清楚，为什么DataPropertyName绑定字段，不显示。所以想获得如ID这些识别记录的值只有放到其他列了。
        //按钮事件
        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex == 1)
            {
                MessageBox.Show(dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString());
            }
        }
4.添加外部按钮取得选取列
        private void button1_Click(object sender, EventArgs e)
        {
            if (dataGridView1.SelectedRows.Count > 0)
            {
                MessageBox.Show(dataGridView1.SelectedRows[0].Cells[1].Value.ToString());
            }
        }
5.其他设置的。
是否允许多行选取：MultiSelect 。
不自动绑定数据表里的字段。
让最后一列宽度延伸满适应上级的宽度：设置改列AutoSizeModel为Fill

6 //dataGridView 删除某一列的操作
 private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex == -1)
            {
                return;
            }
            string action = dataGridView1.Columns[e.ColumnIndex].Name;//操作类型
            if (action == "DelOrder")
            {
                if (MessageBox.Show("确定删除吗?", "提示", MessageBoxButtons.OKCancel,MessageBoxIcon.Warning) == DialogResult.OK)
                {                 
                    string ID = dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString();
                    SellBiClass.DelRules(ID);

}
            }
            NewLoad();
        }
   
        void NewLoad()
        {           
            dataGridView1.DataSource = SellBiClass.GetRules();
        }
7 //dataGridView 格式化每一列
        private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            if (e.ColumnIndex == 7) //哪一列
            {
                if (e.Value.ToString()=="1")
                {
                    e.Value = "特定比例";              
                }
                else
                {
                    e.Value = "默认比例";
                    e.CellStyle.ForeColor = Color.Red;
                }
            }

}
8  获得dataGridView 某一条记录的主键id  this.dataGridView1[第几列, this.dataGridView1.CurrentCell.RowIndex].Value.ToString()
9 不显示出dataGridView1的最后一行空白 dataGridView1.AllowUserToAddRows = false; 设置上这条语句即可黑色头发

10 contextMenuStrip 属性：当用记右击该控件时显示的快捷方式.

11导出excel 

private void pictureBox4_Click(object sender, EventArgs e)
        {
            #region 导出
            if (dataGridView1.Rows.Count > 0)
            {
                SaveFileDialog saveFileDialog = new SaveFileDialog();
                saveFileDialog.DefaultExt = "xls";
                saveFileDialog.Filter = "EXCEL文件(*.XLS)|*.xls";
                saveFileDialog.FilterIndex = 0;
                saveFileDialog.FileName = "客户信息";
                saveFileDialog.RestoreDirectory = true;
                saveFileDialog.CreatePrompt = true;
                saveFileDialog.Title = "导出到EXCEL";
                saveFileDialog.ShowDialog();
                if (saveFileDialog.FileName == "")
                    return;
                Stream myStream;
                myStream = saveFileDialog.OpenFile();
                StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));
                string str = "";
                try
                {
                    for (int i = 0; i < dataGridView1.ColumnCount; i++)
                    {
                        if (i > 0)
                        {
                            str += "\t";
                        }
                        str += dataGridView1.Columns[i].HeaderText;
                    }
                    sw.WriteLine(str);
                    for (int j = 0; j < dataGridView1.Rows.Count; j++)
                    {
                        string tempStr = "";
                        for (int k = 0; k < dataGridView1.Columns.Count; k++)
                        {
                            if (k > 0)
                            {
                                tempStr += "\t";
                            }
                            tempStr += dataGridView1.Rows[j].Cells[k].Value.ToString();
                        }
                        sw.WriteLine(tempStr);
                    }
                    sw.Close();
                    myStream.Close();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
                finally
                {
                    sw.Close();
                    myStream.Close();
                }
            }
            #endregion
        }

12.计算总记录数 (dataGridView1.Rows.Count>0) dataGridView1.Rows.Count>-1包括标题列

13使用button控件进行修改dataGridView中的某一行数据或删除某一行记录
 private void pictureBox2_Click(object sender, EventArgs e)
        {
            #region 赋值
            if (dataGridView1.Rows.Count > 0)
            {
                EmpInfo empInfo = new EmpInfo();
                int index = dataGridView1.CurrentRow.Index;

//记录复制到文本框
                empInfo.EmpId = dataGridView1.Rows[index].Cells[0].Value.ToString();
                empInfo.EmpName = dataGridView1.Rows[index].Cells[1].Value.ToString();
                empInfo.EmpSex = dataGridView1.Rows[index].Cells[2].Value.ToString();
                empInfo.EmpPhone = dataGridView1.Rows[index].Cells[3].Value.ToString();
                empInfo.EmpDate = Convert.ToDateTime(dataGridView1.Rows[index].Cells[4].Value);
                empInfo.EmpPhone = dataGridView1.Rows[index].Cells[5].Value.ToString();
                empInfo.EmpEdu = dataGridView1.Rows[index].Cells[6].Value.ToString();
                empInfo.EmpMarriage = dataGridView1.Rows[index].Cells[7].Value.ToString();
                empInfo.EmpBirth = Convert.ToDateTime(dataGridView1.Rows[index].Cells[8].Value.ToString());
                empInfo.EmpCard = dataGridView1.Rows[index].Cells[9].Value.ToString();
                empInfo.EmpAddress = dataGridView1.Rows[index].Cells[10].Value.ToString();
                empInfo.EmpRemark = dataGridView1.Rows[index].Cells[11].Value.ToString();
                EmpNews empNews = new EmpNews(empInfo);
                empNews.ShowDialog();
                dataGridView1.DataSource = HXX.SeleEmp();
            }
            #endregion
        }

private void pictureBox3_Click(object sender, EventArgs e)
        {
            #region 删除
            if (dataGridView1.Rows.Count > 0)
            {
                int index = dataGridView1.CurrentRow.Index;
                string EmpId = dataGridView1.Rows[index].Cells[0].Value.ToString();
                if (MessageBox.Show("删除后将不能恢复！", "提示信息", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning) == DialogResult.OK)
                {
                    HXX.deleEmp(EmpId);
                    dataGridView1.DataSource = HXX.SeleEmp();
                }
            }
            #endregion
        }