C#DataGridView中的常用技巧

0(最基本的技巧). 获取某列中的某行(某单元格)中的内容
  this.currentposition = this.dataGridView1.BindingContext  [this.dataGridView1.DataSource,   this.dataGridView1.DataMember].Position;
                bookContent = this.database.dataSet.Tables[0].Rows  [this.currentposition][21].ToString().Trim();
                MessageBox.Show(bookContent);

1、自定义列

//定义列宽
            this.dataGridView1.Columns[0].Width = 80;
            this.dataGridView1.Columns[1].Width = 80;
            this.dataGridView1.Columns[2].Width = 180;
            this.dataGridView1.Columns[3].Width = 120;
            this.dataGridView1.Columns[4].Width = 120;

Customize Cells and Columns in the Windows Forms DataGridView Control by Extending Their
    Behavior and Appearance
    Host Controls in Windows Forms DataGridView Cells
    继承 DataGridViewTextBoxCell 类生成新的Cell类，然后再继承 DataGridViewColumn 生成新的Column类，并指定
    CellTemplate为新的Cell类。新生成的Column便可以增加到DataGridView中去。
2、自动适应列宽
    Programmatically Resize Cells to Fit Content in the Windows Forms DataGridView Control
    Samples：
    DataGridView.AutoSizeColumns(
           DataGridViewAutoSizeColumnCriteria.HeaderAndDisplayedRows);
    DataGridView.AutoSizeColumn(
                DataGridViewAutoSizeColumnCriteria.HeaderOnly,
                2, false);
    DataGridView.AutoSizeRow(
                DataGridViewAutoSizeRowCriteria.Columns,
                2, false);
    DataGridView.AutoSizeRows(
              DataGridViewAutoSizeRowCriteria.HeaderAndColumns,
                0, dataGridView1.Rows.Count, false);
3、可以绑定并显示对象
    Bind Objects to Windows Forms DataGridView Controls
4、可以改变表格线条风格
    Change the Border and Gridline Styles in the Windows Forms DataGridView Control
    Samples:
    this.dataGridView1.GridColor = Color.BlueViolet;
    this.dataGridView1.BorderStyle = BorderStyle.Fixed3D;
    this.dataGridView1.CellBorderStyle = DataGridViewCellBorderStyle.None;
    this.dataGridView1.RowHeadersBorderStyle = DataGridViewHeaderBorderStyle.Single;
    this.dataGridView1.ColumnHeadersBorderStyle = DataGridViewHeaderBorderStyle.Single;
5、动态改变列是否显示，和动态改变列的显示顺序
    Change the Order of the Columns in the Windows Forms DataGridView Control
    Samples：
    customersDataGridView.Columns["CustomerID"].Visible = false;
    customersDataGridView.Columns["ContactName"].DisplayIndex = 0;
    customersDataGridView.Columns["ContactTitle"].DisplayIndex = 1;
    customersDataGridView.Columns["City"].DisplayIndex = 2;
    customersDataGridView.Columns["Country"].DisplayIndex = 3;
    customersDataGridView.Columns["CompanyName"].DisplayIndex = 4;
6、可以在列中显示图像
    Display Images in Cells of the Windows Forms DataGridView Control
    Samples：
            Icon treeIcon = new Icon(this.GetType(), "tree.ico");
           DataGridViewImageColumn iconColumn = new DataGridViewImageColumn ();
           iconColumn.Image = treeIcon.ToBitmap();
           iconColumn.Name = "Tree";
           iconColumn.HeaderText = "Nice tree";
           dataGridView1.Columns.Insert(2, iconColumn);
7、格式化显示内容:
    Format Data in the Windows Forms DataGridView Control
    Samples:
    this.dataGridView1.Columns["UnitPrice"].DefaultCellStyle.Format = "c";
    this.dataGridView1.Columns["ShipDate"].DefaultCellStyle.Format = "d";
    this.dataGridView1.DefaultCellStyle.NullValue = "no entry";
    this.dataGridView1.DefaultCellStyle.WrapMode = DataGridViewWrapMode.Wrap;
    this.dataGridView1.Columns["CustomerName"].DefaultCellStyle.Alignment =
                         DataGridViewContentAlignment.MiddleRight;
   
8、在拖动列的滚动条时可以将指定的列冻结
    Freeze Columns in the Windows Forms DataGridView Control
    Samples：将指定列及以前的列固定不动
    this.dataGridView1.Columns["AddToCartButton"].Frozen = true;
9、获取选择的单元格,行,列
    Get the Selected Cells, Rows, and Columns in the Windows Forms DataGridView Control
    Samples:
       见msdn。
10、显示录入时出现的错误信息
    Handle Errors that Occur During Data Entry in the Windows Forms DataGridView Control
    Samples：
    private void dataGridView1_DataError(object sender,
        DataGridViewDataErrorEventArgs e)
        {
        // If the data source raises an exception when a cell value is
        // commited, display an error message.
        if (e.Exception != null &&
            e.Context == DataGridViewDataErrorContext.Commit)
        {
            MessageBox.Show("CustomerID value must be unique.");
        }
        }
11、大数据量显示采用Virtual Mode
    Implement Virtual Mode in the Windows Forms DataGridView Control
12、设置指定的列只读
    Make Columns in the Windows Forms DataGridView Control Read-Only
    Samples：
    dataGridView1.Columns["CompanyName"].ReadOnly = true;
 
13、移去自动生成的列
    Remove Autogenerated Columns from a Windows Forms DataGridView Control
    Sample:
    dataGridView1.AutoGenerateColumns = true;
    dataGridView1.DataSource = customerDataSet;
    dataGridView1.Columns.Remove ("Fax");
    或：
    dataGridView1.Columns["CustomerID"].Visible = false;
14、自定义选择模式
    Set the Selection Mode of the Windows Forms DataGridView Control
    Sample：
    this.dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
    this.dataGridView1.MultiSelect = false;
15、自定义设定光标进入单元格是否编辑模式（编辑模式）
    Specify the Edit Mode for the Windows Forms DataGridView Control
    this.dataGridView1.EditMode = DataGridViewEditMode.EditOnEnter;
16、新行指定默认值
    Specify Default Values for New Rows in the Windows Forms DataGridView Control
    Sample：
    private void dataGridView1_DefaultValuesNeeded(object sender,                       System.Windows.Forms.DataGridViewRowEventArgs e)
    {
      e.Row.Cells["Region"].Value = "WA";
       e.Row.Cells["City"].Value = "Redmond";
       e.Row.Cells["PostalCode"].Value = "98052-6399";
      e.Row.Cells["Region"].Value = "NA";
      e.Row.Cells["Country"].Value = "USA";
    e.Row.Cells["CustomerID"].Value = NewCustomerId();
    }
17、数据验证
    Validate Data in the Windows Forms DataGridView Control
    Samples：
     private void dataGridView1_CellValidating(object sender,
            DataGridViewCellValidatingEventArgs e)
        {
        // Validate the CompanyName entry by disallowing empty strings.
        if (dataGridView1.Columns[e.ColumnIndex].Name == "CompanyName")
        {
            if (e.FormattedValue.ToString() == String.Empty)
            {
                dataGridView1.Rows[e.RowIndex].ErrorText =
                    "Company Name must not be empty";
                e.Cancel = true;
            }
        }
        }
18、数据提交到dataset中
                DataSet ds = new DataSet("MyDataSet");
                ds.Tables[biaom.Trim()].Rows.Clear();
                try
                {
                    for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
                    {
                        DataTable dt = ds.Tables[biaom.Trim()];
                        DataRow myrow = ds.Tables[biaom.Trim()].NewRow();
                        for (int j = 0; j < dataGridView1.Columns.Count; j++)
                        {
                            myrow[j] = Convert.ToString(dataGridView1.Rows[i].Cells[j].Value);
                        }
                        ds.Tables[biaom.Trim()].Rows.Add(myrow);
                    }
                }
                catch (Exception)
                {
                    
                    MessageBox.Show("输入类型错误！");
                    return;
                }