/// <summary>
/// Creates a <see cref="ConstantExpression"/> that has the <see cref="P:ConstantExpression.Value"/>
/// and <see cref="P:ConstantExpression.Type"/> properties set to the specified values. .
/// </summary>
/// <param name="value">An <see cref="System.Object"/> to set the <see cref="P:ConstantExpression.Value"/> property equal to.</param>
/// <param name="type">A <see cref="System.Type"/> to set the <see cref="P:Expression.Type"/> property equal to.</param>
/// <returns>
/// A <see cref="ConstantExpression"/> that has the <see cref="P:Expression.NodeType"/> property equal to
/// <see cref="F:ExpressionType.Constant"/> and the <see cref="P:ConstantExpression.Value"/> and
/// <see cref="P:Expression.Type"/> properties set to the specified values.
/// </returns>
public static ConstantExpression Constant(object value, Type type)
{
ContractUtils.RequiresNotNull(type, nameof(type));
if (value == null ? type.GetTypeInfo().IsValueType&& !TypeUtils.IsNullableType(type) : !type.IsAssignableFrom(value.GetType()))
{
throw Error.ArgumentTypesMustMatch();
}
return(ConstantExpression.Make(value, type));
}
//CONFORMING
public static ConstantExpression Constant(object value)
{
if (value == null)
{
return(ConstantExpression.NullLiteral);
}
Type t = value.GetType();
if (!t.IsEnum)
{
switch (Type.GetTypeCode(t))
{
case TypeCode.Boolean:
return(Constant((bool)value));
case TypeCode.Int32:
int x = (int)value;
int cacheIndex = x + 2;
if (cacheIndex >= 0 && cacheIndex < ConstantExpression.IntCache.Length)
{
ConstantExpression res;
if ((res = ConstantExpression.IntCache[cacheIndex]) == null)
{
ConstantExpression.IntCache[cacheIndex] = res = ConstantExpression.Make(x, typeof(int));
}
return(res);
}
break;
case TypeCode.String:
if (String.IsNullOrEmpty((string)value))
{
return(ConstantExpression.EmptyStringLiteral);
}
break;
}
}
return(ConstantExpression.Make(value, value == null ? typeof(object) : value.GetType()));
}
/// <summary>
/// Creates a <see cref="ConstantExpression"/> that has the <see cref="P:ConstantExpression.Value"/> property set to the specified value. .
/// </summary>
/// <param name="value">An <see cref="System.Object"/> to set the <see cref="P:ConstantExpression.Value"/> property equal to.</param>
/// <returns>
/// A <see cref="ConstantExpression"/> that has the <see cref="P:Expression.NodeType"/> property equal to
/// <see cref="F:ExpressionType.Constant"/> and the <see cref="P:Expression.Value"/> property set to the specified value.
/// </returns>
public static ConstantExpression Constant(object value)
{
return(ConstantExpression.Make(value, value == null ? typeof(object) : value.GetType()));
}