public void TestConvertTo()
{
{
try
{
HandyConvert.ConvertTo <int>(null);
Assert.IsFalse(true);
}
catch (InvalidCastException)
{
}
}
{
HandyConvert.ConvertTo <int>("32");
HandyConvert.ConvertTo <int>(32.5);
HandyConvert.ConvertTo <int?>(32.5);
Assert.IsTrue(HandyConvert.ConvertTo <bool>(123));
Assert.IsTrue(HandyConvert.ConvertTo <bool>(-123));
Assert.IsFalse(HandyConvert.ConvertTo <bool>(0));
}
{
try
{
HandyConvert.ConvertTo <bool>("1");
Assert.IsFalse(true);
}
catch (FormatException)
{
}
}
}
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 static Expression<Func<TEntity, bool>> ToExpression<TEntity>(ParameterExpression param, params Lambda[] lambdas)
//{
//}
private static Expression <Func <TEntity, bool> > GetExpression <TEntity>(ExpressionType expressionType, ParameterExpression param, MemberExpression member, dynamic value, Type propertyType)
{
var convertValue = HandyConvert.ConvertTo(value, propertyType);
if (propertyType.IsNullable())
{
var binary = Expression.MakeBinary(expressionType, member, Expression.Convert(Expression.Constant(convertValue), propertyType));
return(Expression.Lambda <Func <TEntity, bool> >(binary, param));
}
else
{
var binary = Expression.MakeBinary(expressionType, member, Expression.Constant(convertValue));
return(Expression.Lambda <Func <TEntity, bool> >(binary, param));
}
}
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>);
}
