/// <summary> Adds a method dynamically. </summary>
///
/// <param name="typeBuilder"> The type builder. </param>
/// <param name="methodName"> Name of the method. </param>
/// <param name="dynamicMethodData"> Information describing the dynamic method. </param>
private void AddMethodDynamically(TypeBuilder typeBuilder, string methodName, DynamicMethodData dynamicMethodData)
{
Type[] paramTypes = (dynamicMethodData.Params == null || dynamicMethodData.Params.Length == 0) ? null : dynamicMethodData.Params.Select(t => t.Type).ToArray();
MethodBuilder methodBuilder = typeBuilder.DefineMethod(methodName,
MethodAttributes.Public |
MethodAttributes.Static,
dynamicMethodData.ReturnType,
paramTypes);
ILGenerator ILout = methodBuilder.GetILGenerator();
int numParams = dynamicMethodData.Params == null ? 0 : dynamicMethodData.Params.Length;
for (int i = 0; i < numParams; i++)
{
var paramAttribute = ParameterAttributes.None;
if (dynamicMethodData.Params[i].isIn)
{
paramAttribute |= ParameterAttributes.In;
}
if (dynamicMethodData.Params[i].isOut)
{
paramAttribute |= ParameterAttributes.Out;
}
methodBuilder.DefineParameter(i + 1, paramAttribute, dynamicMethodData.Params[i].Name.Replace("@", string.Empty));
}
for (byte x = 0; x < numParams; x++)
{
ILout.Emit(OpCodes.Ldarg_S, x);
}
string methodAction = string.Empty;
if (numParams > 1)
{
for (int y = 0; y < (numParams - 1); y++)
{
switch (methodAction)
{
case "A": ILout.Emit(OpCodes.Add);
break;
case "M": ILout.Emit(OpCodes.Mul);
break;
default: ILout.Emit(OpCodes.Add);
break;
}
}
}
ILout.Emit(OpCodes.Ret);
AddActionAttribute(methodBuilder);
AddFunctionAttribute(methodBuilder, methodName, dynamicMethodData);
}
/// <summary> Adds a function attribute. </summary>
///
/// <param name="methodBuilder"> The method builder. </param>
/// <param name="methodName"> Name of the method. </param>
/// <param name="dynamicMethodData"> Information describing the dynamic method. </param>
private void AddFunctionAttribute(MethodBuilder methodBuilder, string methodName, DynamicMethodData dynamicMethodData)
{
Type attrType = typeof(System.Data.Entity.DbFunctionAttribute);
var attr = new CustomAttributeBuilder(attrType.GetConstructor(
new[] { typeof(string), typeof(string) }),
new object[] { dynamicMethodData.Schema, methodName });
methodBuilder.SetCustomAttribute(attr);
}
/// <summary> Adds the actions to model. </summary>
///
/// <param name="modelBuilder"> The builder that defines the model for the context being
/// created. </param>
/// <param name="schema"> The schema. </param>
/// <param name="dynamicClassFactory"> The dynamic class factory. </param>
///
/// <returns> A Type. </returns>
private static void AddActionsToModel(
DbModelBuilder modelBuilder,
DatabaseSchema schema,
DynamicClassFactory dynamicClassFactory)
{
foreach (var function in schema.Functions)
{
try
{
if (function.ReturnType != null)
{
var dynamicMethodData = new DynamicMethodData();
dynamicMethodData.FunctionType = FunctionType.ModelDefinedFunction;
dynamicMethodData.ReturnType = typeof(Int32);
dynamicMethodData.Schema = function.SchemaOwner;
if (function.Arguments.Count > 0)
{
dynamicMethodData.Params = new DynamicParameterData[function.Arguments.Count];
for (int i = 0; i < function.Arguments.Count; i++)
{
dynamicMethodData.Params[i] = new DynamicParameterData()
{
Name = function.Arguments[i].Name,
Type = function.Arguments[i].DataType.GetNetType(),
isIn = function.Arguments[i].In,
isOut = function.Arguments[i].Out,
Length = function.Arguments[i].Length
};
}
}
_dynamicActionMethods.Add(function.Name, dynamicMethodData);
}
}
catch (Exception exception)
{
DynamicLogger.Instance.WriteLoggerLogError("AddActionsToModel", exception);
}
}
foreach (var procedure in schema.StoredProcedures)
{
try
{
var dynamicMethodData = new DynamicMethodData();
dynamicMethodData.FunctionType = FunctionType.ModelDefinedFunction;
dynamicMethodData.ReturnType = typeof(Int32);
dynamicMethodData.Schema = procedure.SchemaOwner;
if (procedure.Arguments.Count > 0)
{
dynamicMethodData.Params = new DynamicParameterData[procedure.Arguments.Count];
for (int i = 0; i < procedure.Arguments.Count; i++)
{
dynamicMethodData.Params[i] = new DynamicParameterData()
{
Name = procedure.Arguments[i].Name,
Type = procedure.Arguments[i].DataType.GetNetType(),
isIn = procedure.Arguments[i].In,
isOut = procedure.Arguments[i].Out,
Length = procedure.Arguments[i].Length
};
}
}
_dynamicActionMethods.Add(procedure.Name, dynamicMethodData);
}
catch (Exception exception)
{
DynamicLogger.Instance.WriteLoggerLogError("AddActionsToModel", exception);
}
}
try
{
_dynamicActions = CreateTypeAction(dynamicClassFactory, "DbActions", _dynamicActionMethods);
// https://www.nuget.org/packages/EntityFramework.Functions
modelBuilder.AddFunctions(_dynamicActions, false);
}
catch (Exception exception)
{
DynamicLogger.Instance.WriteLoggerLogError("AddActionsToModel", exception);
}
}