DataGridView新特色、常用操作

1、自定义列

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;}}
}

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