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PODataTable Linq join many columns
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  1. PODataTable Linq join many columns
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    copied!<p>I have a trouble with Linq Join. I want to join 2 tables, which they have same structure with n-columns. My problem is i don't know the names of those columns, so how can i rewrite those in select new?</p> <p>Table 1: Here I have some parameters in ID, Name and LastName. Comment, Attribute and the rest are null</p> <pre><code> ID Name LastName Comment Attribute ... "what" "ABC" ... "hello" "SDE" ... 3 lola 1 de 4 miki ... ... ... ... </code></pre> <p>Table 2: Here is the same like Table 1 but it has some parameters in Comment, Attribute and the Rest. </p> <pre><code> ID Name LastName Comment Attribute ... "what" "ABC" ... "hello" "SDE" ... 1 de "hi" 4 miki "OKK" 3 lola "yo" "LL" </code></pre> <p>Result: I would like to have joined Table like this</p> <pre><code> ID Name LastName Comment Attribute ... "what" "ABC" ... "hello" "SDE" ... 3 lola "yo" "LL" 1 de "hi" 4 miki "OKK" ... ... ... ... ... ... </code></pre> <p>My Code would be:</p> <pre><code>var Result= from tb1 in table1.AsEnumerable() join tb2 in tabl2.AsEnumerable() on new { Name = tb1.Field&lt;String&gt;("Name"), LastName = tb1.Field&lt;String&gt;("LastName"), } equals new { Name=tb2.Field&lt;String&gt;("Name"), LastName=tb2.Field&lt;String&gt;("LastName"), } into grp1 from tb3 in grp1.DefaultIfEmpty() select new { ID = tb1.Field&lt;String&gt;("ID"), Name = tb1.Field&lt;String&gt;("Name") , LastName = tb1.Field&lt;String&gt;("LastName"), Comment = tb3!= null ? tb3.Field&lt;String&gt;("Comment") : null, Attribute= tb3!= null ? tb3.Field&lt;String&gt;("Attribute") : null, ... // Here should be next Columns Name but don't know how to put there }; </code></pre> <hr> <p>I tried with this code but my compiler just hanged out, dont know why</p> <pre><code> for (int i = 2; i &lt; table1.Rows.Count; i++) { foreach (DataRow dr in table2.Rows) { if ((table1.Rows[i]["Name"].ToString() == dr["Name"].ToString())&amp;&amp;table1.Rows[i]["LastName"].ToString() == dr["LastName"].ToString()) { table1.Rows.RemoveAt(i); table1.ImportRow(dr); } } } dataGridView1.DataSource = table1; </code></pre>
 

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