C# 在ASP.NET核心中全局重用变量

我必须强迫这些变量在我想使用的每个变量上重复使用，这让我很难。我需要创建一个类来定义这些变量，并在整个程序中使用它们。我该怎么做

string RootFolderName = "Uplaod";
string ProductPictureFolder = "ProductPictureFolder";
string ProductMainPictureFolder = "ProductMainPicture";
string WebRootPath = _hostingEnvironment.WebRootPath;
string RootPath = Path.Combine(WebRootPath, RootFolderName);
string ProductPicturePath = Path.Combine(WebRootPath, RootFolderName, ProductPictureFolder);
string ProductMainPicturePath = Path.Combine(WebRootPath, RootFolderName, ProductPictureFolder, ProductMainPictureFolder);
string newPath = Path.Combine(WebRootPath, ProductMainPicturePath);

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您可以使用singleton类，如下所示：

界面：

public interface IApplicationData
{
    string RootFolderName { get; }

    string ProductPictureFolder { get; }

    string ProductMainPictureFolder { get; }

    string WebRootPath { get; }

    string RootPath { get; }

    string GetProductPicturePath();

    string GetProductMainPicturePath();

    string GetNewPath();
}

public class ApplicationData : IApplicationData
{
    readonly IHostingEnvironment _hostingEnvironment;

    public ApplicationData(IHostingEnvironment hostingEnvironment)
    {
        _hostingEnvironment = hostingEnvironment;
    }

    public string RootFolderName => "Upload";

    public string ProductPictureFolder => "ProductPictureFolder";

    public string ProductMainPictureFolder => "ProductMainPicture";

    public string WebRootPath => _hostingEnvironment.WebRootPath;

    public string RootPath => Path.Combine(WebRootPath, RootFolderName);

    public string GetProductPicturePath()
    {
        return Path.Combine(WebRootPath, RootFolderName, ProductPictureFolder);
    }

    public string GetProductMainPicturePath()
    {
        string path = Path.Combine(WebRootPath, RootFolderName, ProductPictureFolder, ProductMainPictureFolder);
        return path;
    }

    public string GetNewPath()
    {
        string productMainPicturePath = GetProductMainPicturePath();
        return Path.Combine(WebRootPath, productMainPicturePath);
    }
}

services.AddSingleton<IApplicationData, ApplicationData>();

public class ValuesController : ControllerBase
{
    readonly IApplicationData _applicationData;

    public ValuesController(IApplicationData applicationData)
    {
        _applicationData = applicationData;
    }

    [HttpGet]
    public IActionResult Get()
    {
        string data = _applicationData.ProductMainPictureFolder;
        string data2 = _applicationData.GetProductPicturePath();
        string data3 = _applicationData.GetNewPath();

        return Ok();
    }
}

具体实施：

public interface IApplicationData
{
    string RootFolderName { get; }

    string ProductPictureFolder { get; }

    string ProductMainPictureFolder { get; }

    string WebRootPath { get; }

    string RootPath { get; }

    string GetProductPicturePath();

    string GetProductMainPicturePath();

    string GetNewPath();
}

public class ApplicationData : IApplicationData
{
    readonly IHostingEnvironment _hostingEnvironment;

    public ApplicationData(IHostingEnvironment hostingEnvironment)
    {
        _hostingEnvironment = hostingEnvironment;
    }

    public string RootFolderName => "Upload";

    public string ProductPictureFolder => "ProductPictureFolder";

    public string ProductMainPictureFolder => "ProductMainPicture";

    public string WebRootPath => _hostingEnvironment.WebRootPath;

    public string RootPath => Path.Combine(WebRootPath, RootFolderName);

    public string GetProductPicturePath()
    {
        return Path.Combine(WebRootPath, RootFolderName, ProductPictureFolder);
    }

    public string GetProductMainPicturePath()
    {
        string path = Path.Combine(WebRootPath, RootFolderName, ProductPictureFolder, ProductMainPictureFolder);
        return path;
    }

    public string GetNewPath()
    {
        string productMainPicturePath = GetProductMainPicturePath();
        return Path.Combine(WebRootPath, productMainPicturePath);
    }
}

services.AddSingleton<IApplicationData, ApplicationData>();

public class ValuesController : ControllerBase
{
    readonly IApplicationData _applicationData;

    public ValuesController(IApplicationData applicationData)
    {
        _applicationData = applicationData;
    }

    [HttpGet]
    public IActionResult Get()
    {
        string data = _applicationData.ProductMainPictureFolder;
        string data2 = _applicationData.GetProductPicturePath();
        string data3 = _applicationData.GetNewPath();

        return Ok();
    }
}

在DI容器中注册：

public interface IApplicationData
{
    string RootFolderName { get; }

    string ProductPictureFolder { get; }

    string ProductMainPictureFolder { get; }

    string WebRootPath { get; }

    string RootPath { get; }

    string GetProductPicturePath();

    string GetProductMainPicturePath();

    string GetNewPath();
}

public class ApplicationData : IApplicationData
{
    readonly IHostingEnvironment _hostingEnvironment;

    public ApplicationData(IHostingEnvironment hostingEnvironment)
    {
        _hostingEnvironment = hostingEnvironment;
    }

    public string RootFolderName => "Upload";

    public string ProductPictureFolder => "ProductPictureFolder";

    public string ProductMainPictureFolder => "ProductMainPicture";

    public string WebRootPath => _hostingEnvironment.WebRootPath;

    public string RootPath => Path.Combine(WebRootPath, RootFolderName);

    public string GetProductPicturePath()
    {
        return Path.Combine(WebRootPath, RootFolderName, ProductPictureFolder);
    }

    public string GetProductMainPicturePath()
    {
        string path = Path.Combine(WebRootPath, RootFolderName, ProductPictureFolder, ProductMainPictureFolder);
        return path;
    }

    public string GetNewPath()
    {
        string productMainPicturePath = GetProductMainPicturePath();
        return Path.Combine(WebRootPath, productMainPicturePath);
    }
}

services.AddSingleton<IApplicationData, ApplicationData>();

public class ValuesController : ControllerBase
{
    readonly IApplicationData _applicationData;

    public ValuesController(IApplicationData applicationData)
    {
        _applicationData = applicationData;
    }

    [HttpGet]
    public IActionResult Get()
    {
        string data = _applicationData.ProductMainPictureFolder;
        string data2 = _applicationData.GetProductPicturePath();
        string data3 = _applicationData.GetNewPath();

        return Ok();
    }
}

---

你说的每次重建是什么意思？您不能使用静态类或单例类吗？@MoienTajik i使用静态类，但它在主机环境中显示错误。WebRootPath不能使用静态类、方法或property@MoienTajikMean

重用

我的错误正如@MoienTajik所说，使用静态类或单例类。singleton类将帮助您访问局部变量\u hostingEnvironment。如果使用静态类，则可以将_hostingEnvironment.WebRootPath作为参数传递给method@YvesIsrael我不想

Class c=newclass（）

Class