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  1. C# Driver
  2. CSHARP-4695

Expression not supported: string.Concat

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    • Icon: Bug Bug
    • Resolution: Fixed
    • Icon: Unknown Unknown
    • 2.21.0
    • None
    • None
    • None
    • Fully Compatible
    • Not Needed
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      1. What would you like to communicate to the user about this feature?
      2. Would you like the user to see examples of the syntax and/or executable code and its output?
      3. Which versions of the driver/connector does this apply to?

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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

    Description

      String.Concat expression is not supported by LInq Provider. Here is the minimal code to reproduce the problem:

       

      public class StringConcatTests : Linq3IntegrationTest
      {
          [Fact]
          public void String_concat()
          {
              var collection = CreateCollection();
       
              var query = collection.AsQueryable()
                  .Where(i => string.Concat(i.A, i.B) == "A1B1");
       
              var results = query.ToList();
       
              results.Should().OnlyContain(i => (i.A + i.B) == "A1B1");
          }
       
          private IMongoCollection<Data> CreateCollection()
          {
              var collection = GetCollection<Data>("test");
              CreateCollection(
                  collection,
                  new Data { A = "A1", B = "B1" },
                  new Data { A = "A2", B = "B2" });
              return collection;
          }
       
          private class Data
          {
              public string A { get; set; }
       
              public string B { get; set; }
          }
      } 

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            oleksandr.poliakov@mongodb.com Oleksandr Poliakov
            oleksandr.poliakov@mongodb.com Oleksandr Poliakov
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              Created:
              Updated:
              Resolved: