/// <summary>
/// Creates an expression tree representing the binding of the value of a property from a
/// materialization expression to a parameter of the constructor, factory method, etc.
/// </summary>
/// <param name="bindingInfo"> The binding information. </param>
/// <returns> The expression tree. </returns>
public override Expression BindToParameter(ParameterBindingInfo bindingInfo)
{
var property = ConsumedProperties[0];
return(Expression.Call(bindingInfo.MaterializationContextExpression, MaterializationContext.GetValueBufferMethod)
.CreateValueBufferReadValueExpression(property.ClrType, bindingInfo.GetValueBufferIndex(property), property));
}
/// <summary>
/// Creates an expression tree representing the binding of the value of a property from a
/// materialization expression to a parameter of the constructor, factory method, etc.
/// </summary>
/// <param name="bindingInfo"> The binding information. </param>
/// <returns> The expression tree. </returns>
public override Expression BindToParameter(ParameterBindingInfo bindingInfo)
{
var property = ConsumedProperties[0];
return(Expression.Call(
EntityMaterializerSource.TryReadValueMethod.MakeGenericMethod(property.ClrType),
Expression.Call(bindingInfo.MaterializationContextExpression, MaterializationContext.GetValueBufferMethod),
Expression.Constant(bindingInfo.GetValueBufferIndex(property)),
Expression.Constant(property, typeof(IPropertyBase))));
}
/// <summary>
/// Creates an expression tree representing the binding of the value of a property from a
/// materialization expression to a parameter of the constructor, factory method, etc.
/// </summary>
/// <param name="bindingInfo"> The binding information. </param>
/// <returns> The expression tree. </returns>
public override Expression BindToParameter(ParameterBindingInfo bindingInfo)
=> Expression.NewArrayInit(
typeof(object),
_bindings.Select(
b =>
{
var expression = b.BindToParameter(bindingInfo);
if (expression.Type.IsValueType)
{
expression = Expression.Convert(expression, typeof(object));
}
return(expression);
}));
/// <summary>
/// Creates a <see cref="MethodCallExpression" /> using the given method.
/// </summary>
/// <param name="bindingInfo"> Information needed to create the expression. </param>
/// <returns> The expression tree. </returns>
public override Expression CreateConstructorExpression(ParameterBindingInfo bindingInfo)
{
var arguments = ParameterBindings.Select(b => b.BindToParameter(bindingInfo));
Expression expression
= _factoryInstance == null
? Expression.Call(
_factoryMethod,
arguments)
: Expression.Call(
Expression.Constant(_factoryInstance),
_factoryMethod,
arguments);
if (_factoryMethod.ReturnType != RuntimeType)
{
expression = Expression.Convert(expression, RuntimeType);
}
return(expression);
}
public override Expression BindToParameter(ParameterBindingInfo bindingInfo)
=> BindToParameter(
bindingInfo.MaterializationContextExpression,
Expression.Constant(bindingInfo.EntityType));
/// <summary>
/// Creates a <see cref="NewExpression" /> that represents creating an entity instance using the given
/// constructor.
/// </summary>
/// <param name="bindingInfo"> Information needed to create the expression. </param>
/// <returns> The expression tree. </returns>
public override Expression CreateConstructorExpression(ParameterBindingInfo bindingInfo)
=> Expression.New(
Constructor,
ParameterBindings.Select(b => b.BindToParameter(bindingInfo)));
public abstract Expression BindToParameter(ParameterBindingInfo bindingInfo);
/// <summary> /// Creates an expression tree that represents creating an entity instance from the given binding /// information. For example, this might be a <see cref="NewExpression" /> to call a constructor, /// or a <see cref="MethodCallExpression" /> to call a factory method. /// </summary> /// <param name="bindingInfo"> Information needed to create the expression. </param> /// <returns> The expression tree. </returns> public abstract Expression CreateConstructorExpression(ParameterBindingInfo bindingInfo);