瞬态服务具有仅适用于第一个请求的函数

发布于 2025-02-13 12:48:07 字数 1028 浏览 0 评论 0原文

在我的ASP.NET Core 6 MVC项目中，我有一个瞬态服务contentservice。此服务是从icontentservice继承的，并添加到program.cs使用

builder.Services.AddTransient<IContentService, ContentService>();

此处的实现：

public interface IContentService
{
    public string GetText(int id);
}

public class ContentService : IContentService
{
    private readonly ContentDbContext _context;
    private List<string> textList;

    public ContentService(ContentDbContext context)
    {
        _context = context;

        ReadTexts();
    }

    public void ReadTexts()
    {
        // Reads text from the database and fills the textList.
        // THIS CODE MUST RUN ONLY FOR THE FIRST REQUEST.
    }

    public string GetText(int id)
    {
        return textList(id);
    }
}

问题是每次请求contentservice。，构造函数运行，readTexts（）被调用，这是一个重型功能，只能为第一个请求运行。 无论如何是否有使用仅用于第一个请求的代码块实现瞬态服务？请注意，我不能使用addsingleton。

原文

In my asp.net core 6 mvc project, I have a transient service ContentService. This service is inherited from IContentService and added to Program.cs using

builder.Services.AddTransient<IContentService, ContentService>();

Here is the implementation of the service:

public interface IContentService
{
    public string GetText(int id);
}

public class ContentService : IContentService
{
    private readonly ContentDbContext _context;
    private List<string> textList;

    public ContentService(ContentDbContext context)
    {
        _context = context;

        ReadTexts();
    }

    public void ReadTexts()
    {
        // Reads text from the database and fills the textList.
        // THIS CODE MUST RUN ONLY FOR THE FIRST REQUEST.
    }

    public string GetText(int id)
    {
        return textList(id);
    }
}

The problem is every time ContentService is requested, the constructor runs and ReadTexts() is called, which is a heavy function that must only run for the first request. Is there anyway to implement a transient service with a code block that runs only for the first request? Note that I cannot use AddSingleton.

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我纯我任性 2025-02-20 12:48:07

如果您希望它持有数据，则必须将文字清单作为静态列表，仅应首先请求阅读。

尝试一下。

public class ContentService : IContentService
{
    private readonly ContentDbContext _context;
    private static List<string> textList = new List<string>();

    public ContentService(ContentDbContext context)
    {
        _context = context;

        ReadTexts();
    }

    public void ReadTexts()
    {
       if(!textList.Any())
       {
        // Reads text from the database and fills the textList.
        // THIS CODE MUST RUN ONLY FOR THE FIRST REQUEST.
       }
    }

    public string GetText(int id)
    {
        return textList(id);
    }
}

You have to make textList as static if you want it to hold data which should be read only on first request.

try this.

public class ContentService : IContentService
{
    private readonly ContentDbContext _context;
    private static List<string> textList = new List<string>();

    public ContentService(ContentDbContext context)
    {
        _context = context;

        ReadTexts();
    }

    public void ReadTexts()
    {
       if(!textList.Any())
       {
        // Reads text from the database and fills the textList.
        // THIS CODE MUST RUN ONLY FOR THE FIRST REQUEST.
       }
    }

    public string GetText(int id)
    {
        return textList(id);
    }
}

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