CODEWITHSUNDEEP
c#sqldapper
DinaDee
DinaDee

Reputation: 287

c# dapper error when parameter is list<int> No mapping exists from object type <>f__AnonymousType20`1[[System.Int32[]

string sqlQuery = "SELECT SellingPrice, MarkupPercent, MarkupAmount FROM ProfitMargins WHERE QuoteId in @QuoteId";
var profitMargin = await ctx.Database.SqlQuery<dynamic>(sqlQuery, 
    new { QuoteId = new[] { 1, 2, 3, 4, 5 } }
//String.Join(", ", QuoteIds.ToArray()))).ToListAsync();

can someone see what I am doing wrong?

No mapping exists from object type <>f__AnonymousType20`1[[System.Int32[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=]] to a known managed provider native type.

I got this idea from this post: SELECT * FROM X WHERE id IN (…) with Dapper ORM answered by: @LukeH

UPDATE:

I need it returned into a list . see my whole function, I've changed the code according to the answer posted by @JFM, but now cannot add .ToListAsync

@JFM 

public static async Task<List<dynamic>> GetProfitMargin(List<int> QuoteIds)
{
    using (var conn = new SqlConnection(new MYContext().Database.Connection.ConnectionString))
    {   
       string sqlQuery = "SELECT SellingPrice, MarkupPercent, MarkupAmount FROM ProfitMargins WHERE QuoteId in @QuoteId";
        {
            var profitMargin =  conn.Query<dynamic>(sqlQuery
               , new { QuoteId = new[] { 1, 2, 3, 4, 5 } }).ToListAsync());                    
        }

Upvotes: 1

Views: 1897

Answers (3)

Void Ray
Void Ray

Reputation: 10219

Not 100% sure what the issue is, but below is an example of how you can work with Dynamics:

    [Test]
    public void TestDynamicsTest()
    {
        var query = @"select 1 as 'Foo', 2 as 'Bar' union all select 3 as 'Foo', 4 as 'Bar'";

        var result = _connection.Query<dynamic>(query);

        Assert.That(result.Count(), Is.EqualTo(2));
        Assert.True(result.Select(x => x.Foo == 1).First());
        Assert.True(result.Select(x => x.Bar == 4).Last());
    }

Update

public class Person
{
    public int Id { get; set; }
    public string Name { get; set; }
}

var query = @"select 1 as 'Id', 'Foo' as 'Name' union all select 1 as 'Id', 'Bar' as 'Name'";
var result = _connection.Query<Person>(query);

foreach (var person in result)
{
    var output = string.Format("Id: {0}, Name: {1}", person.Id, person.Name);
}

For more examples, check out Dapper docs.

Upvotes: 1

M B
M B

Reputation: 2326

public static async Task<IEnumerable<dynamic>> GetProfitMargin(List<int> QuoteIds)
    {

        using (var conn = new SqlConnection(new MYContext().Database.Connection.ConnectionString))
        {   
           string sqlQuery = "SELECT SellingPrice, MarkupPercent, MarkupAmount FROM ProfitMargins WHERE QuoteId in @QuoteId";
            {
                IEnumerable<dynamic> profitMargin =  await conn.QueryAsync<dynamic>(sqlQuery
                   , new { QuoteId = new[] { 1, 2, 3, 4, 5 } });                    
            }

If you don't map it to a list or array, by default it will be an IEnuerable.

Upvotes: 2

JFM
JFM

Reputation: 763

Using Dapper to query and map dynamic works well for me:

string sqlQuery = "SELECT SellingPrice, MarkupPercent, MarkupAmount FROM ProfitMargins WHERE QuoteId in @QuoteId";

using(var conn = new SqlConnection(myConnString)
{
    var profitMargin = conn.Query<dynamic>(sqlQuery
       , new { QuoteId = new[] { 1, 2, 3, 4, 5 } });

}

Upvotes: 1

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