C # GridView Operation Summary

GridView Operation Summary 1. Custom ColumnsCustomize Cells and Columns in the Windows Forms DataGridView Control by Extending Their Behavior and Appearance Host Controls in Windows Forms DataGridView Cells inherit the DataGridViewTextBoxCell class to generate a new Cell class, then inherit the DataGridViewColumn to generate a new Column Class, and specify the CellTemplate as the new Cell class. The newly generated Column can be added to the DataGridView. 2. automatically adapt to column width Programmatically Resize Cells to Fit Content in the Windows Forms DataGridView Control Samples: dview. autoSizeColumns (maid. headerAndDisplayedRows); DataGridView. autoSizeColumn (maid. headerOnly, 2, false); DataGridView. autoSizeRow (maid. columns, 2, false); DataGridView. autoSizeRows (maid. headerAndColumns, 0, dataGridView1.Rows. count, false ); 3. objects can be bound and displayed. Bind Objects to Windows Forms DataGridView Controls 4. You can change the line style of a table. Change the Border and Gridline Styles in the Windows Forms DataGridView Control Samples: this. dataGridView1.GridColor = Color. bluevilet; this. dataGridView1.BorderStyle = BorderStyle. fixed3D; this. dataGridView1.CellBorderStyle = maid. none; this. dataGridView1.RowHeadersBorderStyle = DataGridViewHeaderBorderStyle. single; this. dataGridView1.ColumnHeadersBorderStyle = DataGridViewHeaderBorderStyle. single; 5. dynamically change whether the column is displayed, and dynamically change the Column Display sequence. Change the Order of the Columns in the Windows Forms DataGridView Control Samples: mermersdatagri. columns ["CustomerID"]. visible = false; customersdatagri. columns ["ContactName"]. displayIndex = 0; customersdatagri. columns ["ContactTitle"]. displayIndex = 1; customersdatagri. columns ["City"]. displayIndex = 2; customersdatagri. columns ["Country"]. displayIndex = 3; customersdatagri. columns ["CompanyName"]. displayIndex = 4; 6. images can be displayed in columns. Display Images in Cells of the Windows Forms DataGridView Control Samples: Icon treeIcon = new Icon (this. getType (), "tree. ico "); maid (); iconColumn. image = treeIcon. toBitmap (); iconColumn. name = "Tree"; iconColumn. headerText = "Nice tree"; dataGridView1.Columns. insert (2, iconColumn ); 7. format the display content: 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 = maid. wrap; this. dataGridView1.Columns ["mermername"]. defaultCellStyle. alignment = maid. middleRight; 8. When dragging a column's scroll bar, you can freeze the specified column. Freeze Columns in the Windows Forms DataGridView Control Samples: fix the specified column and the previous column. this. dataGridView1.Columns ["AddToCartButton"]. Frozen = true; 9. Obtain the selected cells, rows, and columns. Get the Selected Cells, Rows, and Columns in the Windows Forms DataGridView Control Samples: see msdn. 10. Display Error information during Input 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 = maid. Commit) {MessageBox. Show ("CustomerID value must be unique .");}} 11. Use Virtual Mode for displaying large data volumesImplement Virtual Mode in the Windows Forms DataGridView Control 12. Set the specified column to read-only Make Columns in the Windows Forms DataGridView Control Read-Only Samples: Maid ["CompanyName"]. ReadOnly = true; 13. Remove automatically generated Columns Remove Autogenerated Columns from a Windows Forms DataGridView Control Sample: dataGridView1.AutoGenerateColumns = true; dataGridView1.DataSource = customerDataSet; dataGridView1.Columns. remove ("Fax"); or: dataGridView1.Columns ["mermerid"]. visible = false; 14. Custom selection mode Set the Selection Mode of the Windows Forms DataGridView Control Sample: this. dataGridView1.SelectionMode = DataGridViewSelectionMode. FullRowSelect; this. dataGridView1.MultiSelect = false; 15. Set whether the cursor enters the cell editing mode (edit mode)Specify the Edit Mode for the Windows Forms DataGridView Control this. dataGridView1.EditMode = maid Mode. EditOnEnter; 16. Specify the default value for the new line. Specify Default Values for New Rows in the Windows Forms DataGridView Control Sample: private void datagridview1_defavaluesneeded (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. Data Verification Validate Data in the Windows Forms DataGridView Control Samples: private void maid cellvalidating (object sender, DataGridViewCellValidatingEventArgs e) {// Validate the CompanyName entry by disallowing empty strings. if (maid [e. columnIndex]. name = "CompanyName") {if (e. formattedValue. toString () = String. empty) {maid [e. rowIndex]. errorText = "Company Name must not be empty"; e. cancel = true ;}}}