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ColumnChanging

ColumnChanging

ColumnChanging

ColumnChanging

1

Reject the proposed value by setting the column error (SetColumnError) from within the column-changing event handler .

从 ColumnChanging 事件处理程序内设置列错误（SetColumnError ），从而拒绝建议的值。

2

This walkthrough uses the ColumnChanging event to verify that an acceptable value is being entered into the record .

本演练使用 ColumnChanging 事件来验证输入到记录中的值是可接受的。

3

The first time that you double-click a column , the designer generates an event handler for the ColumnChanging event .

首次双击一列时，设计器会为 ColumnChanging 事件生成事件处理程序。

4

When you set the property , an exception is generated if an exception occurs in the ColumnChanging event .

设置该属性时，如果 ColumnChanging 事件中发生异常，则会生成异常。

5

Double-click the Quantity column in the OrderDetails table to create the OrderDetailsDataTable_ColumnChanging event handler .

双击 OrderDetails 表中的 Quantity 列来创建 OrderDetailsDataTable_ColumnChanging 事件处理程序。

6

This action creates the ColumnChanging event handler of the DataTable.

此操作将创建 DataTable 的 ColumnChanging 事件处理程序。

7

In addition to the ColumnChanging event , an If. . . Then statement is also created that tests for the specific column.

除了 ColumnChanging 事件之外，还会创建用于测试特定列的 If …Then 语句。

8

Explains how to use the ColumnChanging event to verify that an acceptable value is being entered into the record .

解释如何使用 ColumnChanging 事件验证输入到记录中的值是否可接受。

9

Validation events (for example , ColumnChanging, RowChanging, and so on ) will not be raised when constraints are turned off .

在约束关闭时，不会引发验证事件（例如，ColumnChanging 、RowChanging 等）。

10

The column-changing event handler should look similar to the following

ColumnChanging 事件处理程序应该与以下所示类似

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