private static Expression <Func <TEntity, bool> > GetContainExpression <TEntity>(ParameterExpression param, Lambda lambda, MemberExpression member)
{
if (lambda.Value is IEnumerable)
{
var convertValue = HandyConvert.ToList(lambda.Value as IEnumerable, lambda.PropertyType);
var methodInfo = typeof(List <>).MakeGenericType(lambda.PropertyType).GetMethod("Contains");
var body = Expression.Call(Expression.Constant(convertValue), methodInfo, member);
return(Expression.Lambda <Func <TEntity, bool> >(body, param));
}
else
{
throw new ArgumentException("Contain 只适用与数组、集合等容器");
}
}
public void TestToList()
{
Assert.IsNull(HandyConvert.ToList <string>(null));
Assert.IsTrue(HandyConvert.ToList <string>(new string[] { "", "dd" }).Count == 2);
Assert.IsTrue(HandyConvert.ToList <int>(new string[] { "456", "123" }).Count == 2);
Assert.IsNotNull(HandyConvert.ToList(new string[] { "", "dd" }, typeof(string)) as List <string>);
Assert.IsNotNull(HandyConvert.ToList(new HandyConvertTest_A[]
{
new HandyConvertTest_A
{
a = "aa"
},
new HandyConvertTest_A
{
a = "bb"
}
}, typeof(HandyConvertTest_A)) as List <dynamic>);
}