查询动态参数。不支持异常

Question

我在使用 Dapper 查询参数时遇到小问题。

我有：

WebApi 接收包含所有必需数据（实体名称、列、过滤器等）的请求。最深层的过滤器具有以下结构（此模型由 ctor 从 api 模型构建）：

    public class QueryFilterItem
    {
        public string Name { get; }
        public string FieldName { get; }
        public object Value { get; }
        public ComparisonType ComparisonType { get; }
    }

查询执行器，它处理 api 调用

var arguments = new ExpandoObject();
// ...
arguments.TryAdd($"{filter.Name}Entity{filter.FieldName}", filter.Value);
// ... This part above is a part of another helper class, which is dynamically building filter query data

IEnumerable<dynamic> result;

using (var connection = DbConnectionFactory.CreateDbConnection())
{
    result = connection.Query(sqlQuery, arguments); // tried with wrapping into DynamicParameters
}

从该代码中，我得到了这个异常：

System.NotSupportedException: The member MyFilterItemEntityId 
of type System.Text.Json.JsonElement cannot be used as a parameter value
   at Dapper.SqlMapper.LookupDbType(Type type, String name, Boolean demand, ITypeHandler& handler) in /_/Dapper/SqlMapper.cs:line 418
   at Dapper.DynamicParameters.AddParameters(IDbCommand command, Identity identity) in /_/Dapper/DynamicParameters.cs:line 232
   at Dapper.DynamicParameters.Dapper.SqlMapper.IDynamicParameters.AddParameters(IDbCommand command, Identity identity) in /_/Dapper/DynamicParameters.cs:line 151
   at Dapper.SqlMapper.<>c__DisplayClass165_0.<GetCacheInfo>b__0(IDbCommand cmd, Object obj) in /_/Dapper/SqlMapper.cs:line 1714
   at Dapper.CommandDefinition.SetupCommand(IDbConnection cnn, Action`2 paramReader) in /_/Dapper/CommandDefinition.cs:line 129
   at Dapper.SqlMapper.<QueryImpl>d__140`1.MoveNext() in /_/Dapper/SqlMapper.cs:line 1080
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Dapper.SqlMapper.Query[T](IDbConnection cnn, String sql, Object param, IDbTransaction transaction, Boolean buffered, Nullable`1 commandTimeout, Nullable`1 commandType) in /_/Dapper/SqlMapper.cs:line 725
   at Dapper.SqlMapper.Query(IDbConnection cnn, String sql, Object param, IDbTransaction transaction, Boolean buffered, Nullable`1 commandTimeout, Nullable`1 commandType) in /_/Dapper/SqlMapper.cs:line 652
   at DappertStorageTest.Cqrs.SelectQueryHandler.GetByFilters(SelectQuery query)
   at DappertStorageTest.Cqrs.SelectQueryHandler.Handle(SelectQuery query)
   at System.Dynamic.UpdateDelegates.UpdateAndExecute2[T0,T1,TRet](CallSite site, T0 arg0, T1 arg1)
   at MAS.DappertStorageTest.Cqrs.Infrastructure.QueryProcessor.Execute[TResult](IQuery`1 query)
   at MAS.DapperStorageTest.Controllers.DataController.Select(SelectRequest selectRequest)
   at Microsoft.Extensions.Internal.ObjectMethodExecutor.Execute(Object target, Object[] parameters)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<<InvokeActionMethodAsync>g__Logged|12_1>d.MoveNext()

Arguments values (not part of exception):

sqlQuery: USE [DapperStorageTest];SELECT * FROM [Passenger] WHERE ([Id] = @MyFilterItemEntityId)

Arguments: {[MyFilterItemEntityId, ValueKind = String : "7d570abd-576d-425f-9d24-d84314d299ba"]} (raw)

有人可以帮我吗？

Answer 1

感谢 web api 模型 映射引起的异常。根据 api 模型过滤器值具有 object 类型和 asp.net 核心映射字符串到 JsonElement。从 object 切换到 string 类型。

public class QueryFilterItem
    {
        public string Name { get; }
        public string FieldName { get; }
        public object Value { get; } // Here
        public ComparisonType ComparisonType { get; }
    }

查询动态参数。不支持异常

Query dynamic parameters. NotSupportedException

c#

mapping

json

asp.net-web-api