![]() All you must do is set the CellTemplate property of your class from within its constructor. ![]() Although you can override many of the members of this class, you generally won’t need to. Once you’ve created the cell, you create a class that inherits from the DataGridViewColumn class. If you want to change the way the cell draws its contents, you’ll need to override the class’ Paint method, as in this article’s example. In your class, you can override any of the many protected members of the base class. You start by creating a class that inherits from the DataGridViewCell class (or some class that itself inherits from the DataGridViewCell class). The concept behind creating your own custom DataGridView column type is simple. Three views of the same column, at different widths. The finished form looks like this, including a column displaying a bar graph instead of boring old numbers.įigure 2. Figure 2 shows three views of the same column, at different widths, demonstrating the behavior of the sample column.įigure 1. As you expand the column, the bar expands to fill the available space. In addition, the column scales the data to fit within the cell bounds, given the maximum value for the column. This form pulls its data from the SQL Server 2000 Northwind sample database, although you could easily choose a different table for your own demonstration-just make sure your data source includes an integer column. The finished result of your exercise should look something like the form shown in Figure 1. Once you’ve worked through this example, you should be ready to graduate to more complex column types. To get you started creating your own column types for the DataGridView control, this article walks you through creating the bar graph cell type. I quickly ripped out a version for my friend, and later solidified it for inclusion here. It turns out that tasks once difficult have become simple, as is often the case in. Remembering back to the painful experiences I had suffering a similar torture working with the GridView control in Visual Studio 2003, I started with some trepidation. ![]() How do you do this in a DataGridView control?Īlthough it wasn’t my first thought, it quickly became clear after a little research that the answer was to create a new type of column for the DataGridView control. We’ve found this to be a totally effective way to include graphical information in a simple table. Then we display the value of the field next to the bar. We create the bar by displaying a solid bitmap, setting the width to be the value from the field. ![]() In one of the columns, we display a simple little bar graph corresponding to a value from a table. We display a table of values in a Web page. Recently, I got an e-mail from a friend that went something like this: If the question is really interesting, however, I can’t help myself from digging in. I do the best I can to solve all the issues that come up, but generally refer random questions to the public newsgroups. I tend to get random e-mail requests for programming help. In this article, you’ll learn how to take advantage of inheritance to create your own bar graph column in a grid cell. Creating custom column types for the DataGridView control isn’t nearly as tricky as it once was. ![]()
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