ResetCachedValue(UltraDataColumn) メソッド

指定した列に関連付けられたキャッシュされたセル値をクリアします。この結果、次回セル値が必要になると、そのセルに対して CellDataRequested イベントが発生します。

シンタックス

Visual Basic

'宣言
 
Public Overloads Sub ResetCachedValue( _
   ByVal column As UltraDataColumn _
) 

C#

public void ResetCachedValue( 
   UltraDataColumn column
)

パラメータ

column

セル値がクリアされる列を指定します。

解説

すべてのセルの値をクリアするには、UltraDataRow の ResetCachedValues メソッドを使用できます。UltraDataRowsCollection も行コレクションのすべての行のセル値をクリアすることができる UltraDataRowsCollection.ResetCachedValues メソッドを公開します。

使用例

Visual Basic

Imports Infragistics.Shared
Imports Infragistics.Win
Imports Infragistics.Win.UltraWinDataSource


    Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim ds As UltraDataSource = New UltraDataSource()
        ds.Band.Columns.Add("Col1", GetType(String))
        ds.Rows.Add()

        ' Calling ResetCachedValues on the UltraDataSource will clear cached
        ' cell values in all rows in all bands.
        ds.Rows(0)("Col1") = "Value"
        Debug.WriteLine("Before reset cell value = " & ds.Rows(0)("Col1"))
        ds.ResetCachedValues()
        Debug.WriteLine("After reset cell value = " & ds.Rows(0)("Col1"))

        ' Calling ResetCachedValues on a band will clear the cached cell values
        ' in all rows associated with the band.
        ds.Rows(0)("Col1") = "Value"
        Debug.WriteLine("Before reset cell value = " & ds.Rows(0)("Col1"))
        ds.Band.ResetCachedValues()
        Debug.WriteLine("After reset cell value = " & ds.Rows(0)("Col1"))

        ' Calling ResetCachedValues on a row collection will clear the cached 
        ' cell values in all rows in the row collection.
        ds.Rows(0)("Col1") = "Value"
        Debug.WriteLine("Before reset cell value = " & ds.Rows(0)("Col1"))
        ds.Rows.ResetCachedValues()
        Debug.WriteLine("After reset cell value = " & ds.Rows(0)("Col1"))

        ' Cached cell values associated with a column can be cleared across
        ' all rows using ResetCachedValues method off the UltraDataColumn
        ' object.
        ds.Rows(0)("Col1") = "Value"
        Debug.WriteLine("Before reset cell value = " & ds.Rows(0)("Col1"))
        ds.Band.Columns("Col1").ResetCachedValues()
        Debug.WriteLine("After reset cell value = " & ds.Rows(0)("Col1"))

        ' Calling ResetCachedValues on a row will clear the cached cell values
        ' in that row.
        ds.Rows(0)("Col1") = "Value"
        Debug.WriteLine("Before reset cell value = " & ds.Rows(0)("Col1"))
        ds.Rows(0).ResetCachedValues()
        Debug.WriteLine("After reset cell value = " & ds.Rows(0)("Col1"))

        ' Cached value can be cleared on a single cell using the 
        ' ResetCachedValue method of the row and passing in the column.
        ds.Rows(0)("Col1") = "Value"
        Debug.WriteLine("Before reset cell value = " & ds.Rows(0)("Col1"))
        ds.Rows(0).ResetCachedValue("Col1")
        Debug.WriteLine("After reset cell value = " & ds.Rows(0)("Col1"))
    End Sub

C#

using Infragistics.Shared;
using Infragistics.Win;
using Infragistics.Win.UltraWinDataSource;
using System.Diagnostics;


		private void button1_Click(object sender, System.EventArgs e)
		{
			UltraDataSource ds = new UltraDataSource( );
			ds.Band.Columns.Add( "Col1", typeof( string ) );
			ds.Rows.Add( );

			// Calling ResetCachedValues on the UltraDataSource will clear cached
			// cell values in all rows in all bands.
			ds.Rows[0]["Col1"] = "Value";
			Debug.WriteLine( "Before reset cell value = " + ds.Rows[0]["Col1"] );			
			ds.ResetCachedValues( );
			Debug.WriteLine( "After reset cell value = " + ds.Rows[0]["Col1"] );

			// Calling ResetCachedValues on a band will clear the cached cell values
			// in all rows associated with the band.
			ds.Rows[0]["Col1"] = "Value";
			Debug.WriteLine( "Before reset cell value = " + ds.Rows[0]["Col1"] );			
			ds.Band.ResetCachedValues( );
			Debug.WriteLine( "After reset cell value = " + ds.Rows[0]["Col1"] );

			// Calling ResetCachedValues on a row collection will clear the cached 
			// cell values in all rows in the row collection.
			ds.Rows[0]["Col1"] = "Value";
			Debug.WriteLine( "Before reset cell value = " + ds.Rows[0]["Col1"] );			
			ds.Rows.ResetCachedValues( );
			Debug.WriteLine( "After reset cell value = " + ds.Rows[0]["Col1"] );

			// Cached cell values associated with a column can be cleared across
			// all rows using ResetCachedValues method off the UltraDataColumn
			// object.
			ds.Rows[0]["Col1"] = "Value";
			Debug.WriteLine( "Before reset cell value = " + ds.Rows[0]["Col1"] );
			ds.Band.Columns["Col1"].ResetCachedValues( );
			Debug.WriteLine( "After reset cell value = " + ds.Rows[0]["Col1"] );

			// Calling ResetCachedValues on a row will clear the cached cell values
			// in that row.
			ds.Rows[0]["Col1"] = "Value";
			Debug.WriteLine( "Before reset cell value = " + ds.Rows[0]["Col1"] );
			ds.Rows[0].ResetCachedValues( );
			Debug.WriteLine( "After reset cell value = " + ds.Rows[0]["Col1"] );

			// Cached value can be cleared on a single cell using the 
			// ResetCachedValue method of the row and passing in the column.
			ds.Rows[0]["Col1"] = "Value";
			Debug.WriteLine( "Before reset cell value = " + ds.Rows[0]["Col1"] );
			ds.Rows[0].ResetCachedValue("Col1");
			Debug.WriteLine( "After reset cell value = " + ds.Rows[0]["Col1"] );
		}