gridcontrol实现分组，并实现分组总计，平均统计

依靠gridcontrol强大的属性功能实现分组，并依据分组总计，平均统计等。本实例根据班级分组计算班级总分与平均分。

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        189  2015-06-27 21:25  demo003\demo003\App.config

     文件      11776  2015-06-27 21:25  demo003\demo003\bin\Debug\demo003.exe

     文件        189  2015-06-27 21:25  demo003\demo003\bin\Debug\demo003.exe.config

     文件      24064  2015-06-27 21:25  demo003\demo003\bin\Debug\demo003.pdb

     文件      24224  2015-06-27 21:26  demo003\demo003\bin\Debug\demo003.vshost.exe

     文件        189  2015-06-27 21:25  demo003\demo003\bin\Debug\demo003.vshost.exe.config

     文件        490  2013-06-18 20:28  demo003\demo003\bin\Debug\demo003.vshost.exe.manifest

     文件       4824  2015-06-27 21:18  demo003\demo003\demo003.csproj

     文件       1242  2015-06-27 21:25  demo003\demo003\Form1.cs

     文件       5729  2015-06-27 21:25  demo003\demo003\Form1.Designer.cs

     文件       5817  2015-06-27 21:25  demo003\demo003\Form1.resx

     文件        564  2015-06-27 21:26  demo003\demo003\obj\Debug\demo003.csproj.FileListAbsolute.txt

     文件        977  2015-06-27 21:25  demo003\demo003\obj\Debug\demo003.csproj.GenerateResource.Cache

     文件     115956  2015-06-27 21:18  demo003\demo003\obj\Debug\demo003.csprojResolveAssemblyReference.cache

     文件      11776  2015-06-27 21:25  demo003\demo003\obj\Debug\demo003.exe

     文件        410  2015-06-27 21:25  demo003\demo003\obj\Debug\demo003.exe.licenses

     文件        180  2015-06-27 21:25  demo003\demo003\obj\Debug\demo003.Form1.resources

     文件      24064  2015-06-27 21:25  demo003\demo003\obj\Debug\demo003.pdb

     文件        180  2015-06-27 21:18  demo003\demo003\obj\Debug\demo003.Properties.Resources.resources

     文件     115188  2015-06-27 21:04  demo003\demo003\obj\Debug\DesignTimeResolveAssemblyReferences.cache

     文件       7629  2015-06-27 21:04  demo003\demo003\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件          0  2015-06-27 21:03  demo003\demo003\obj\Debug\TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs

     文件          0  2015-06-27 21:03  demo003\demo003\obj\Debug\TemporaryGeneratedFile_5937a670-0e60-4077-877b-f7221da3dda1.cs

     文件          0  2015-06-27 21:03  demo003\demo003\obj\Debug\TemporaryGeneratedFile_E7A71F73-0F8D-4B9B-B56E-8E70B10BC5D3.cs

     文件        519  2015-06-27 21:03  demo003\demo003\Program.cs

     文件       1338  2015-06-27 21:03  demo003\demo003\Properties\AssemblyInfo.cs

     文件        252  2015-06-27 21:25  demo003\demo003\Properties\licenses.licx

     文件       2866  2015-06-27 21:03  demo003\demo003\Properties\Resources.Designer.cs

     文件       5612  2015-06-27 21:03  demo003\demo003\Properties\Resources.resx

     文件       1094  2015-06-27 21:03  demo003\demo003\Properties\Settings.Designer.cs

............此处省略14个文件信息