/// <summary>
/// 获取值
/// </summary>
/// <param name="expression">表达式</param>
public object GetValue(Expression expression)
{
if (expression == null)
{
return(null);
}
var result = Lambda.GetValue(expression);
if (result == null)
{
return(null);
}
var type = result.GetType();
if (type.IsEnum)
{
return(Enum.GetValue(type, result));
}
return(result);
}
public void TestGetValue_Enum()
{
var test1 = new Sample {
NullableEnumValue = EnumSample.C
};
Expression <Func <Sample, bool> > expression = test => test.EnumValue == EnumSample.D;
Assert.Equal(EnumSample.D.Value(), Enum.GetValue <EnumSample>(Lambdas.GetValue(expression)));
expression = test => test.EnumValue == test1.NullableEnumValue;
Assert.Equal(EnumSample.C, Lambdas.GetValue(expression));
expression = test => test.NullableEnumValue == EnumSample.E;
Assert.Equal(EnumSample.E, Lambdas.GetValue(expression));
expression = test => test.NullableEnumValue == test1.NullableEnumValue;
Assert.Equal(EnumSample.C, Lambdas.GetValue(expression));
test1.NullableEnumValue = null;
expression = test => test.NullableEnumValue == test1.NullableEnumValue;
Assert.Null(Lambdas.GetValue(expression));
}