C datagridview bound to datatable not updating

Posted by / 30-Sep-2019 13:57

Follow the link below to discover more features of i Grid, such as auto-filter functionality, built-in grouping, etc.

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.

If Data Grid View is bound to a Data Table using its Data Source property, implementing a simple filter like substring search for a column is trivial.

We can exploit the Data Table functionality for that, and this filtering will work very fast – even for thousands of rows: The situation is much worse if your Data Grid View works in unbound mode and you need to hide or show its rows calculating a condition for every row.

This works very fast without any tricks, such as copying the data into a temporary storage to filter them there.

You can download a demo application demonstrating that Data Grid View hides rows slowly, especially in comparison with i Grid: As you can see, i Grid beats Data Grid View when filtering rows and can be also a good replacement for the slow Data Grid View control in many other scenarios.

As you have seen, we can improve the situation with slow data loading into Data Grid View. For example, you might programmatically resize all columns immediately after loading data, or you might programmatically resize a specific row after a particular cell value has been modified. Get Preferred Width() methods or by calling protected resizing method overloads in a derived Data Grid View control. You will typically call the programmatic resizing methods at specific times.Slow Data Grid View rendering can be fixed using so called double buffering.It is a technique used to draw a control’s contents to a temporary buffer and then copying the whole control image on the screen, which may greatly reduce or prevent flickering. NET controls have the public Boolean property that allows the developer to easily enable double buffering, but for some unknown reasons the authors of the .

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If you solved the task of unbound Data Grid View population for the first time, you could write code like this to create the Data Grid View on the screenshot above: You should know about two more tricks that can be used to improve the situation with Data Grid View slow population even more.

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