将列表视图中的选定项目添加到另一个列表视图

Question

我想将每个已处理SelectedItem的 from添加ListView A为ListView B一种历史记录。如果我只为一个对象编写此代码，但当我尝试向其中添加另一个对象时，ListView B它没有显示任何内容。我知道我必须将其反序列化为 aList<obj>但它不起作用。你能帮我吗？这是我到目前为止所尝试的：// ListView A (Source)// the ItemSelected is processed this function is calledpublic void AddToHistory(Object obj){    string fileName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "history.txt");    var content = JsonConvert.SerializeObject(obj);    File.WriteAllText(fileName, content);}// ListView B (Destination View)void CreateListOfObjects(){    ObjectList = new List<Object>();    string fileName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "history.txt");    var content = File.ReadAllText(fileName);    var json = JsonConvert.DeserializeObject<Object>(content);    ObjectList.Add(json);}private List<Object> _object;public List<Object> ObjectList{    get => _object;    set => SetValue(ref _object, value);}

Answer 1

尝试使用 File.AppendAllText 而不是 File.WriteAllText，因为 WriteAllText 会在写入时覆盖现有文件。

public void CreateListOfObjects()

    {

        string fileName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "history.txt");

        var content = File.ReadAllText(fileName);

        var itemList = JsonConvert.DeserializeObject<List<string>>(content);

        foreach(var item in itemList)

        {

            listView2.Items.Add(item);

        }

    }

Answer 2

我终于找到了解决方法。现在我首先使用一个 List 来为我的对象数组提供包装器。

// ListView A (Source)

// when ItemSelected is processed this function is called

public void AddToHistory(Object obj)

{

    string fileName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "history.txt");

    var _tempList = new List<Object>();

    if (File.Exist(fileName) 

    {

        var _tempContent = File.ReadAllText(fileName);

        var json = JsonConvert.DeserializeObject<List<Object>>(tempContent);

        _tempList.AddRange(json);

        _tempList.Add(obj);

    } else 

    {

        _tempList.Add(obj);

    }

    var content = JsonConvert.SerializeObject(_tempList);

    File.WriteAllText(fileName, content);

}

// ListView B (Destination View)

void CreateListOfObjects()

{

    ObjectList = new List<Object>();

    string fileName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "history.txt");

    var content = File.ReadAllText(fileName);

    var json = JsonConvert.DeserializeObject<List<Object>>(content);

    ObjectList.AddRange(json);

}