In this article I will explain with an example, how to use the LINQ to select multiple columns from DataTable in C# and VB.Net. Database I have made use of the following table Customers with the schema as follows. I have already inserted few records in the table. Note: You ca...
在大数据量的前提下，会出现列很多的情况，浏览器会呈现出滚动条，但是用户需要看到的并不一定是所有的信息，那么就需要对表格的数据进行筛选，在前面的文章中介绍到了搜索和排序，这都是对数据的筛选功能，但是列数过多会导致用户查看数据非常麻烦。如果可以将不想看到的列隐藏掉就可以了，下面来看一下代码。
{ result = "<span style=\"color:red\">" + "否" + "</span>"; } return result; }, "targets": [4], "visible": true }, ], columns: [ { data: 'wdlx' }, { data: 'wdmc' }, { "sClass": "text-left", "data": "fj", "render": function (data, type, row, meta) ...
usingSystem;usingSystem.Data;publicclassA{publicstaticvoidMain(){ DataTable table =newDataTable("Orders"); table.Columns.Add("OrderID",typeof(Int32)); table.Columns.Add("OrderQuantity",typeof(Int32)); table.Columns.Add("CompanyName",typeof(string)); table.Columns.Add("Date",typeof(DateT...
usingSystem;usingSystem.Data;publicclassA{publicstaticvoidMain(){ DataTable table =newDataTable("Orders"); table.Columns.Add("OrderID",typeof(Int32)); table.Columns.Add("OrderQuantity",typeof(Int32)); table.Columns.Add("CompanyName",typeof(string)); table.Columns.Add("Date",typeof(DateT...
另外,几个列可以同时被隐藏和显示,只需使用columns()方法选中多列,再用columns().visible()方法设置可见性状态。 If you are looking for a more complete column visibility interaction controls ColVis for DataTables provides a complete interface for allowing the user to show and hide columns in the table...
C# Linq Group By on multiple columns C# LINQ List<KeyValuePair<string, KeyValuePair<int, int>>> Group by to List<KeyValuePair<string, List<KeyValuePair<int, int>>> C# LINQ one condition, return multiple columns and rows C# LINQ order by not working for a SQL table with a primary ke...
DataTable dt = new DataTable("foo"); DataColumn pkCol = new DataColumn("ID", Type.GetType("System.Int32")); pkCol.AutoIncrement = true; pkCol.AutoIncrementSeed = 1; pkCol.AutoIncrementStep = 1; dt.Columns.Add(pkCol); dt.PrimaryKey = new DataColumn[] { pkCol };...
我使用PrimeFacesV5.3 dataTable和liveScroll="true“和selectionMode="multiple”。标头复选框只选择可见行,当我向下滚动时,新行将显示为非选定行。我希望标题复选框可以选择所有行:可见行和不可见行。只选择可见行是没有意义的,也是无用的。有可能修好吗?我试图通过处理"toggleSelect、rowSelectCheckbox和row 浏览...
dt.Columns.Add(newDataColumn("日期时间值",typeof(DateTime))); dt.Columns.Add(newDataColumn("布尔值",typeof(bool)));for(inti =1; i <=2; i++) { dr=dt.NewRow(); dr[0] =i; dr[1] ="项"+i.ToString(); dr[2] =DateTime.Now; ...