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If you are allowed to use LINQ, take a look at the following example. It creates two DataTables with integer columns, fills them with some records, join them using LINQ query and outputs them to Console. DataTable dt1 = new DataTable(); dt1.Columns.Add("CustID", typeof(int)); dt1.Columns.Add("ColX", typeof(int));
5 wrz 2013 · join b in dtCounties.AsEnumerable() on new { a.CountyCode, a.StateCode } equals new {. b.Field<string>("COUNTYCODE"), b.Field<string>("StateCode") where b.Field<bool>("TrueOrFalse") == true. select new. CountyCode = a.CountyCode, TrueOrFalse= b.Field<bool>("TrueOrFalse"), Sum= a.Sum.
In this article, we’ll take a look at how to use LINQ to join multiple tables on multiple conditions. We’ll start by discussing the basics of LINQ joins, and then we’ll show you how to use LINQ to join tables on different columns, on the same column, and on multiple columns.
The Merge method is used to merge two DataTable objects that have largely similar schemas. A merge is typically used on a client application to incorporate the latest changes from a data source into an existing DataTable.
20 wrz 2010 · Here's a sample of a LEFT OUTER JOIN in LINQ using two conditions: MyDataContext db = new MyDataContext (); string username = "test"; IEnumerable<MyType> query = from c in db.MyCategories join s in db.MySettings on new { Username=username, CategoryId=c.CategoryId } equals new { Username=s.UserId, CategoryId=s.CategoryId } into tmp from ss in tmp.
30 kwi 2024 · Learn how to join two DataTables in ASP.NET C# using LINQ for efficient data integration. Explore techniques to merge and query DataTables, leveraging LINQ's powerful capabilities for seamless data processing and integration within ASP.NET applications.
29 maj 2024 · The Join method, which is called by the join clause in C#, implements an inner join. The following examples show you how to perform four variations of an inner join: A simple inner join that correlates elements from two data sources based on a simple key. An inner join that correlates elements from two data sources based on a composite key. A ...
