C#中對DatagridView部分常用操作

0(最基本的技巧)、擷取某列中的某行(某儲存格)中的內容
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、自訂欄
//定義列寬
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

繼承 DataGridViewTextBoxCell 類產生新的Cell類，然後再繼承 DataGridViewColumn 產生新的Column類，並指定
CellTemplate為新的Cell類。新產生的Column便可以增加到DataGridView中去。

2、自動適應列寬
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、可以綁定並顯示對象
Bind Objects to Windows Forms DataGridView Controls

4、可以改變表格線條風格
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、動態改變列是否顯示，和動態改變列的顯示順序
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、可以在列中顯示映像
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、格式化顯示內容:
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、在拖動列的捲軸時可以將指定的列凍結
Freeze Columns in the Windows Forms DataGridView ControlSamples：
將指定列及以前的列固定不動this.dataGridView1.Columns["AddToCartButton"].
Frozen = true;

9、擷取選擇的儲存格,行,列

Get the Selected Cells, Rows,
and Columns in the Windows Forms DataGridView ControlSamples:

10、顯示錄入時出現的錯誤資訊
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、大資料量顯示採用Virtual Mode
Implement Virtual Mode in the Windows Forms DataGridView Control

12、設定指定的列唯讀
Make Columns in the Windows Forms DataGridView Control Read-OnlySamples：

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

13、移去自動產生的列
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、自訂
選擇模式
Set the Selection Mode of the Windows Forms DataGridView ControlSample：

this.dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
this.dataGridView1.MultiSelect = false;

15、自訂設定游標進入儲存格是否編輯模式（編輯模式）
Specify the Edit Mode for the Windows Forms DataGridView

Controlthis.dataGridView1.EditMode = DataGridViewEditMode.EditOnEnter;

16、新行指定預設值
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、資料驗證
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、資料提交到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("輸入類型錯誤！");
return;
}