Datagridview rowvalidating vs cellvalidating
Because Not Set restores the value inheritance, the Resizable property will never return a Not Set value unless the row or column has not been added to a Data Grid View control. Set Resizable to Not Set to restore the inheritance. For maximum performance, use programmatic resizing instead so that you can resize at specific times, such as immediately after new data is loaded. To avoid performance penalties, use the automatic sizing modes that calculate sizes based only on the displayed rows rather than analyzing every row in the control.Data Grid View控件 Data Grid View是用于Windows Froms 2.0的新网格控件。它可以取代先前版本中Data Grid控件，它易于使用并高度可定制，支持很多我们的用户需要的特性。 关于本文档： 本文档不准备面面俱到地介绍Data Grid View，而是着眼于深入地介绍一些技术点的高级特性。 本文档按逻辑分为5个章节，首先是结构和特性的概览，其次是内置的列/单元格类型的介绍，再次是数据操作相关的内容，然后是主要特性的综述，最后是最佳实践。 大部分章节含有一个“Q & A”部分，来回答该章节相关的一些常见问题。注意，某些问题会由于知识点的关联性重复出现在多个章节。这些问题、答案及其附带的示例代码都包含在本文档的附录部分。 内容 1 何为Data Grid View.. Excluding rows is useful to avoid a performance penalty when you are working with a large quantity of rows. For all sizing enumerations, values with names that refer to displayed cells limit their calculations to cells in displayed rows. For example, if a column is hidden after it is automatically sized to fit a large cell value, the hidden column will not change its size if the row containing the large cell value is deleted.
28 5.2.2 Row Pre Paint and Post Paint 29 5.3 Autosizing. 33 5.3.5 Customizing Content-based Sizing Behavior. By default, the Resizable property value is based on the Allow User To Resize Columns property value for columns and the Allow User To Resize Rows property value for rows. The sizing mode for a column is actually determined by its Inherited Auto Size Mode property. To configure the sizing mode for headers and rows and for columns that do not override the control value, set one or more of the following Data Grid View properties: To override the control's column sizing mode for an individual column, set its Auto Size Mode property to a value other than Not Set. If the State value includes the Resizable Set flag, the Resizable property value is not inherited. If you need to determine whether the Resizable property value of a row or column is inherited, examine its State property.
Programmatic resizing is useful to avoid performance penalties with continuous resizing.