WebC# LINQ计数和按不同列分组,c#,linq,datatable,C#,Linq,Datatable,我想计算一下用户编辑或创建了多少文档。因此,我有一个数据表,其中包含如下信息: Input DocumentName ModifiedBy CreatedBy a Frank Frank b Mike Frank c John Mike 这应该是输出: Name DocumentsModified(Total) DocumentsCreated WebNov 3, 2014 · DataTable table = new DataTable (); using (SqlConnection connection = new SqlConnection ( "Data Source= (local); Initial Catalog=AdventureWorks2014;Integrated Security=SSPI" )) using (SqlCommand cmd = new SqlCommand ( "SELECT BusinessEntityID AS ID, FirstName, MiddleName, LastName FROM Person.Person", …
C# Convert DataTable to List of Objects Dynamically
WebJun 7, 2024 · According to your code, you use the where statement to only obtain data with specific conditions and convert the query to a list. This is a good way to speed up the query. I add one more suggestion that if you are using a local sql-server, please try to use sqlite, it's faster in many ways. Best Regards, Daniel Zhang T.Zacks 3,936 WebC# Datatable使用行修改列,c#,datatable,multiple-columns,C#,Datatable,Multiple Columns,我想在Datatable中修改我的表。 我知道我必须使用linq并对结果进行分组。 how many ml is in primary tubing
C#中DataTable和List互转的示例代码 - 编程宝库
WebTo filter on one or only a few of values in a long list, first clear the (Select All) check box and then select the values you want. To filter for null values (a null value indicates the … WebNov 16, 2005 · DataRow [] dr = ds.Tables [0].Select ( "COUNT (DISTINCT (site_name))" ); object x = ds.Tables [0].Compute ( "COUNT (DISTINCT (site_name))", "ProductionCount > 0" ); The filter in the Compute I don't really want because I'd like to count distinct on all rows..but the method forces me ot have a filter expression thanks mike Nov 16 '05 # 2 WebAug 18, 2024 · The 4 arguments to each Add () call match up with the 4 columns already added. Detail We print a cell value from the first row (row 0) and the Dosage column … how many ml is in a mg