不使用linq过滤对象列表C＃

Question

I have a list of objects called images which are obtained from parsing through a text file. They contain details such as the catagory and description. I want to be able to search through the list to find the images with a certain catagory and then display them on a form i have setup. I want to filter through them and then also be able to revert back to the unfiltered view aswell.

class Image
{
    public string FileName { set; get; }
    public string Description { set; get; }
    public string Catagory { set; get; }
    public string Date { set; get; }
    public string Comments { set; get; }
}

This is what i want to do in Linq

string chosenCatagory = CatagoryComboBox.Text;

ImageList = ImageList.Where(x => x.Catagory == chosenCatagory).ToList();

What would be the best way to approach this without using Linq?

Answer 1

您可以使用List的FindAll方法：

ImageList = ImageList.FindAll(x => x.Catagory == chosenCatagory);

Answer 2

Use two Lists. ImageList which contains all data and DisplayList which is filled only with the stuff you want to display.

DisplayList = ImageList.FindAll(x => x.Catagory == chosenCatagory);

And if you want to revert set DisplayList back to ImageList.

DisplayList = ImageList;

Also have a look at CollectionView when you wanna do more advanced stuff. It supports filtering, grouping and sorting.