C#中对DatagridView部分常用操作

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 TheirBehavior and
AppearanceHost 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 ControlSamples：
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 ControlSamples:

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 ControlSamples：

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 ControlSamples：

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 ControlSamples:

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 ControlSamples：
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 ControlSamples:


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 ControlSamples：

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-OnlySamples：

dataGridView1.Columns["CompanyName"].ReadOnly = true;

13、移去自动生成的列
Remove Autogenerated Columns from a Windows Forms DataGridView ControlSample:

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 ControlSample：

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

Controlthis.dataGridView1.EditMode = DataGridViewEditMode.EditOnEnter;

16、新行指定默认值
Specify Default Values for New Rows in the Windows
Forms DataGridView ControlSample：

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 ControlSamples：

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;
}