如何正確設置 localappdata 路徑，不顯示完整路徑（Path.Combine & Environment.GetFolderPath）

Question

我正在嘗試 Path.Combine，但突出顯示了字符串（appdatapath），助手說“字段初始化程序無法引用非靜態字段、方法或屬性'MySuperAPP.appdatapath'”

代碼是：

string appdatapath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);

string path = Path.Combine(appdatapath, "second/part/of/folderpath");

我想要的是：字符串路徑=“C：/Users/USER/AppData/Local/Some/Dir/”

我嘗試了什么：

string static appdatapath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);

string static path = Path.Combine(appdatapath,"second/part/of/folderpath").ToString;

和

public static string GetMyLocalAppDir()
        {
            return Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData).ToString();
        }
string path = Path.Combine(GetMyLocalAppDir(),"second/part/of/folderpath").ToString;

我認為我嘗試的變體可能是錯誤的..）需要你的建議）謝謝！）

Answer 1

當您initialize一個字段時（這意味着：當您在runtime為一個動態字段提供一個值時）它必須是一個static值。 因此，您必須將“appdatapath”聲明為static 。

public partial class MainWindow : Window
{
    private static string appdatapath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);

    private (static) string path = System.IO.Path.Combine(appdatapath, "second/part/of/folderpath"); //make this static if you want that this field can't be changed.
    public MainWindow()
    {
        InitializeComponent();
    }
}

還要確保您的聲明順序正確：

public or private static or not類型，例如name of variable type eg string名稱

最后：如果您有更多目錄要組合，請將每個部分分開放置：

Path.Combine(appdatapath, "second", "part", "of", "folderpath")

Answer 2

    public static void Read_bootup3_file()
    {
        qq = 0;
        string downloadz2;

        string fileNameSDcard = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "download.txt");
        string CurrentContents;
        CurrentContents = fileNameSDcard;
//CurrentContents = File.ReadAllText(fileNameSDcard);
        File.WriteAllText(fileNameSDcard, CurrentContents);

        using (StreamReader sr = new StreamReader(fileNameSDcard))
        {
            downloadz2 = sr.ReadToEnd();
        }
//downloadz = downloadz2.ToCharArray();

        qq = 0;
        for (leep = 0; leep <= lotsize; leep++)
        {
            for (lep = 0; lep <= 20; lep++)
            {
                Tester.garage_array_database[lep, leep] = downloadz[qq].ToString();
                qq++;
            }
        }