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POThe best way to search in DataTable on multiple conditions in C#?
 

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  1. POThe best way to search in DataTable on multiple conditions in C#?
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    <p>I have 2 <code>DataTable</code> with the following columns:</p> <blockquote> <p>Table 1</p> <ul> <li>Title</li> <li>NUMBER</li> <li>Sub_num1 </li> <li>Sub_num2</li> </ul> <p>Table 2</p> <ul> <li>NUMBER</li> <li>Sub_num1</li> <li>Sub_num2</li> </ul> </blockquote> <p>In <code>Table 2</code> Combination of NUMBER, Sub_num1 and Sub_num2 is unique. Can be Many NUMBERS, but with different set of Sub1 and Sub2.</p> <p>In Table 1 Title is unique. A couple titles can have the same NUMBER, but again different set of Subs.</p> <p>I need to loop through <code>Table 2</code> and check if <code>Table 1</code> has exact match with all 3 columns, then get this title, if not I need to get all Titles that have this NUMBER.</p> <p>What is the best and fastest way to do this search? On the top of my head I have only next: Loop through records in Table 2 and for each record loop through Table 1 and check for match, but I think that this process can be very resource-intensive...</p> <p>Any help, please?</p> <p><strong>UPDATE</strong> Example:</p> <pre><code> var dt1 = new DataTable("Table 1"); dt1.Columns.Add("title", typeof(string)); dt1.Columns.Add("number", typeof(int)); dt1.Columns.Add("subnum1", typeof(int)); dt1.Columns.Add("subnum2", typeof(int)); dt1.Rows.Add(new object[] { "a", 1111, 1, 1 }); // Exact match! dt1.Rows.Add(new object[] { "b", 2222, 1, 1 }); // Only NUMBER match dt1.Rows.Add(new object[] { "b", 2222, 2, 2 }); // Only NUMBER match dt1.Rows.Add(new object[] { "d", 3333, 1, 1 }); // Exact match! dt1.Rows.Add(new object[] { "d", 3333, 1, 2 }); dt1.Rows.Add(new object[] { "d", 3333, 2, 1 }); var dt2 = new DataTable("Table 2"); dt2.Columns.Add("number", typeof(int)); dt2.Columns.Add("subnum1", typeof(int)); dt2.Columns.Add("subnum2", typeof(int)); dt2.Rows.Add(new object[] { 1111, 1, 1 }); // Exact match! dt2.Rows.Add(new object[] { 2222, "", 5 }); // Only NUMBER match dt2.Rows.Add(new object[] { 3333, 1, 1 }); // Exact match! dt2.Rows.Add(new object[] { 3333, "", "" }); // Only NUMBER match </code></pre> <p>SO I'm looping through Table 2:</p> <pre><code>foreach (DataRow row in dt2.Rows) { // HERE Should be logic and search } </code></pre> <p>RESULT should be: If match print title, if not print ALL titleS with number, that match, so:</p> <pre><code>1. "a", 1111, 1, 1 2.1 "b", 2222, 1, 1 2.2 "b", 2222, 2, 2 3. "d", 3333, 1, 1 4.1 "d", 3333, 1, 1 4.2 "d", 3333, 1, 2 4.3 "d", 3333, 2, 1 </code></pre>
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    1. USBryuk
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. COYou can try LINQ on the DataTable which makes it easier to query it as you it on SQL table.
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      1. POThe best way to search in DataTable on multiple conditions in C#?
      1. USPushCode
    2. COHow many rows are you expecting in each table? (it matters)
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      1. POThe best way to search in DataTable on multiple conditions in C#?
      1. USRBarryYoung
    3. COTable 1 has 1k - 10k rows. Table 2 has 100 - 1000 rows
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      1. POThe best way to search in DataTable on multiple conditions in C#?
      1. USBryuk
 

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