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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.data.linq.mapping.resulttypeattribute.type below:

ResultTypeAttribute.Type Property (System.Data.Linq.Mapping) | Microsoft Learn

ResultTypeAttribute.Type Property Definition

Gets the valid or expected type mapping for a function having various result types.

public:
 property Type ^ Type { Type ^ get(); };
public Type Type { get; }
member this.Type : Type
Public ReadOnly Property Type As Type
Property Value

The type of result (Type).

Examples 
[Function(Name="dbo.VariableResultShapes")]
[ResultType(typeof(VariableResultShapesResult1))]
[ResultType(typeof(VariableResultShapesResult2))]
public IMultipleResults VariableResultShapes([Parameter(DbType="Int")] System.Nullable<int> shape)
{
    IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())), shape);
    return ((IMultipleResults)(result.ReturnValue));
}

<FunctionAttribute(Name:="dbo.VariableResultShapes"), _
ResultType(GetType(VariableResultShapesResult1)), _
ResultType(GetType(VariableResultShapesResult2))> _
Public Function VariableResultShapes(<Parameter(DbType:="Int")> ByVal shape As System.Nullable(Of Integer)) As IMultipleResults
    Dim result As IExecuteResult = Me.ExecuteMethodCall(Me, CType(MethodInfo.GetCurrentMethod, MethodInfo), shape)
    Return CType(result.ReturnValue, IMultipleResults)
End Function
Remarks

This attribute applies to functions returning various result types. It is used to declare the possible result types returned from the function. For inheritance types, only the root type of the inheritance hierarchy needs to be specified.

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