我如何重用单个方法而不是创建多个副本答案

【问题标题】：How can i reuse a single method instead of creating multiple copies我如何重用单个方法而不是创建多个副本
【发布时间】：2021-03-29 09:32:54
【问题描述】：

我有一个方法可以打开文件夹浏览器对话框，然后将字符串属性设置为配置应用程序设置。

因为我有多个可以在同一页面上配置的文件夹。我希望能够重用相同的方法。我应该注意什么？

我试过传入一个唯一的参数，但是方法需要调用 FirstFolder、SecondFolder 等属性来获取和设置值，如何在运行时在一个方法中更改这些目标属性？

ConfigurationView.xaml

<StackPanel Orientation="Horizontal">
    <TextBlock Text="First Folder : "/>
    <TextBox Text="{Binding FirstFolder}"/>
    <Button Content=". ." cal:Message.Attach="[Event Click] = [OpenFolderDialog]"/>
</StackPanel>

<StackPanel Orientation="Horizontal">
    <TextBlock Text="Second Folder : " />
    <TextBox Text="{Binding SecondFolder}" />
    <Button Content=". ." cal:Message.Attach="[Event Click] = [OpenFolderDialog]"/>
</StackPanel>

ConfigurationViewModel.cs

public class ConfigLocationsViewModel : Screen
{
    private readonly IConfiguration _config;
    private readonly IDialogService _dialogService;

    private firstFolder, secondFolder;

    public string FirstFolder
    {
        get { return firstFolder; }
        set { firstFolder= value; NotifyOfPropertyChange(() => FirstFolder); }
    }

    public string SecondFolder
    {
        get { return secondFolder; }
        set { secondFolder= value; NotifyOfPropertyChange(() => SecondFolder); }
    }

    public ConfigLocationsViewModel(IConfiguration config, IDialogService dialogService)
    {
        _config = config;
        _dialogService = dialogService;

        FirstFolder = _config.GetValue<string>("FolderLocations:FirstFolder");
        SecondFolder= _config.GetValue<string>("FolderLocations:SecondFolder");
    }

    public void SaveFirstFolder() => SaveSettings.AddOrUpdateAppSetting("FolderLocations:FirstFolder", FirstFolder);
    public void SaveSecondFolder() => SaveSettings.AddOrUpdateAppSetting("FolderLocations:SecondFolder", SecondFolder);

    // How to reuse this for Multiple Folders not just "FirstFolder"
    public void OpenFirstFolderDialog()
    {
        var settings = new FolderBrowserDialogSettings
        {
            Description = "Select First folder.",
            SelectedPath = IOPath.GetDirectoryName(FirstFolder ?? Assembly.GetExecutingAssembly().Location)
        };

        bool? success = _dialogService.ShowFolderBrowserDialog(this, settings);
        if (success == true)
        {
            FirstFolder = settings.SelectedPath + @"\";
            SaveFirstFolder();
        }
    }

    public void OpenSecondFolderDialog()
    {
        var settings = new FolderBrowserDialogSettings
        {
            Description = "Select Second folder.",
            SelectedPath = IOPath.GetDirectoryName(SecondFolder ?? Assembly.GetExecutingAssembly().Location)
        };

        bool? success = _dialogService.ShowFolderBrowserDialog(this, settings);
        if (success == true)
        {
            SecondFolder = settings.SelectedPath + @"\";
            SaveSecondtFolder();
        }
    }
}

【问题讨论】：

标签： c# wpf xaml mvvm

【解决方案1】：

好吧，我想不出一个“聪明”的方法来做到这一点，所以我使用了一个简单的 switch 语句，传入一个识别参数。

public void OpenFolderDialog(string folder)
{
    var settings = new FolderBrowserDialogSettings
    {
        Description = $"Select {folder} folder.",
        SelectedPath = IOPath.GetDirectoryName(folder ?? Assembly.GetExecutingAssembly().Location)
    };

    bool? success = _dialogService.ShowFolderBrowserDialog(this, settings);
    if (success == true)
    {
        switch(binding)
        {
            case "FirstFolder":
                FirstFolder = settings.SelectedPath + @"\";
                SaveFirstFolder();
                break;
            case "SecondFolder":
                SecondFolder= settings.SelectedPath + @"\";
                SaveSecondFolder();
                break;
             etc..
             etc..
        }
    }
}

【讨论】：

【解决方案2】：

使用命令绑定：

<Button Command="{Binding OpenFolderCommand}" CommandParameter="{Binding FirstFolder}"/>

<Button Command="{Binding OpenFolderCommand}" CommandParameter="{Binding SecondFolder}"/>

【讨论】：