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i have code like this : 

  var list = _appData.GetAdvanceSearchData(Convert.ToInt16(collection["Product"])).ToList();
   List<ProductMaterial> materials = list.Select(x => x.ProductMaterial).Distinct().ToList();

Exception I got :

Cannot implicitly convert type 'System.Collections.Generic.List<string>' to 'System.Collections.Generic.List<Crescent.LinqModel.ProductMaterial>'

whst should be done ?

Product Material Class :

 public class ProductMaterial
{
    public string ProductMaterials {get;set;}
}

list.Select(x => x.ProductMaterial).Distinct().ToList() gives me array string though have converted to list , i want the result of type 'ProductMaterial'.

DharaPPatel
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3 Answers3

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Use this instead:

var materials = list.Select(x => x.ProductMaterial).Distinct().ToList();

Or:

List<string> materials = list.Select(x => x.ProductMaterial).Distinct().ToList();

The only thing that is different is the type of the materials variable.

Daniel Hilgarth
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I guess you want DistinctBy

List<ProductMaterial> materials =
    list.DistinctBy(x => x.ProductMaterial).ToList();

You can use that extension method or search for some other implementation here

Community
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BrunoLM
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The query list.Select(x => x.ProductMaterial).Distinct().ToList(); returns List<string> not List<ProductMaterial>.

You can use List instead of List<ProductMaterial>. I am not sure about what you want.I could have given a more precise opinion if data type of list was specified.

Aneesh Mohan
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  • @DharaPPatel what is the data type of var list ? if var list is List then you can use **WHERE** instead of **SELECT** to query down distinct entries – Aneesh Mohan Jun 04 '13 at 12:18