public void OrderStrTest()
{
var condition = new QueryCondition <Vendor>();
condition.AddSort("Number", "DESC");
var vendors = GetTestList();
var query = vendors.AsQueryable().OrderBy(condition.Sorts.ConvertToSortString());
var data = query.ToList();
Assert.NotNull(data);
Assert.True(data.Count == 2);
Assert.True(data[0].Name == "AB");
Assert.True(data[0].Number == vendors[1].Number);
Assert.True(data[1].Name == "ABC");
Assert.True(data[1].Number == vendors[0].Number);
}