如何在 .net core 3.1 中使用 ConfigurationBulder 绑定到配置类 [英] How can I bind to a configuration class using ConfigurationBulder in .net core 3.1

问题描述

我想使用 ConfigurationBuidler 来读取我的 appsettings.json 文件.我看不出我做错了什么.

我的文件是

<代码>{"comment": "这在构建时被复制到 bin\debug.应用程序更新了副本.但是要记住你需要将它们粘贴到这里的设置","col1Width": "344"}

我的测试失败

[测试方法]public void TestMethod1(){var configuration = Helper.LoadConfiguration("appsettings.json");Assert.IsTrue(configuration.Properties.Keys.Contains("col1Width"));//这里失败}

我的助手类是

公共静态类助手{公共静态ConfigurationBuilder LoadConfiguration(字符串文件名){var configuration = new ConfigurationBuilder();var currentDirectory = System.IO.Directory.GetCurrentDirectory();configuration.SetBasePath(currentDirectory);configuration.AddJsonFile(path: filename, optional: false, reloadOnChange: true);配置.构建();返回配置；}}

[更新]

我根据 Marco 指出的博客文章更正了问题标题并更新了代码如下.

只有.Bind不可用

公共静态类助手{公共静态 FeedReadConfiguration GetApplicationConfiguration(){var configuration = new FeedReadConfiguration();var currentDirectory = System.IO.Directory.GetCurrentDirectory();var iConfig = GetIConfigurationRoot(currentDirectory);配置.GetSection("FeedRead").绑定(配置)；//无法使用返回配置；}公共静态 IConfigurationRoot GetIConfigurationRoot(string outputPath){返回新的 ConfigurationBuilder().SetBasePath(输出路径).AddJsonFile("appsettings.json").建造();}}公共类 FeedReadConfiguration{公共 int Col1Width { 获取；放;}}

解决方案

根据显示的设置文件，没有"FeedRead"部分

需要直接从根读取设置.

public static class Helper {公共静态 FeedReadConfiguration GetApplicationConfiguration( ) {var currentDirectory = System.IO.Directory.GetCurrentDirectory();var iConfig = GetIConfigurationRoot(currentDirectory);//Microsoft.Extensions.Configuration.Binder.dllFeedReadConfiguration 配置 = iConfig.Get();返回配置；}公共静态 IConfiguration GetIConfigurationRoot(string outputPath) {返回新的 ConfigurationBuilder().SetBasePath(输出路径).AddJsonFile("appsettings.json").建造();}}

参考 ASP.NET Core 中的配置

参考 ASP.NET Core 中的选项模式

I want to use ConfigurationBuidler to read my appsettings.json file. I cant see what I am doing wrong.

My file is

{
  "comment": "this gets copied to bin\debug on build. the app updates the copy. However to remember the settings you need to paste them here",
  "col1Width": "344"
}

My test fails

[TestMethod]
public void TestMethod1()
{
    var configuration = Helper.LoadConfiguration("appsettings.json");
    Assert.IsTrue(configuration.Properties.Keys.Contains("col1Width")); // fails here
}

My helper class is

public static  class Helper
{
    public static ConfigurationBuilder LoadConfiguration(string filename)
    {
        var configuration = new ConfigurationBuilder();
        var currentDirectory = System.IO.Directory.GetCurrentDirectory();
        configuration.SetBasePath(currentDirectory);
        configuration.AddJsonFile(path: filename, optional: false, reloadOnChange: true);
        configuration.Build();
        return configuration;
    }
}

[Update]

I corrected the question title and updated the code as follows according to the Blog Post Marco pointed me to.

Only .Bind is not available

public static  class Helper
{
    public static FeedReadConfiguration GetApplicationConfiguration( )
    {
        var configuration = new FeedReadConfiguration();
        var currentDirectory = System.IO.Directory.GetCurrentDirectory();

        var iConfig = GetIConfigurationRoot(currentDirectory);

        iConfig
            .GetSection("FeedRead")
            .Bind(configuration); // Not available

        return configuration;
    }

    public static IConfigurationRoot GetIConfigurationRoot(string outputPath)
    {
        return new ConfigurationBuilder()
            .SetBasePath(outputPath)
            .AddJsonFile("appsettings.json")
            .Build();
    }

}
public class FeedReadConfiguration
{
    public int Col1Width { get; set; }
}

解决方案

Based on the shown settings file, there is no "FeedRead" section

The settings would need to be read directly from the root.

public static class Helper {
    public static FeedReadConfiguration GetApplicationConfiguration( ) {

        var currentDirectory = System.IO.Directory.GetCurrentDirectory();

        var iConfig = GetIConfigurationRoot(currentDirectory);

        //Microsoft.Extensions.Configuration.Binder.dll
        FeedReadConfiguration configuration = iConfig.Get<FeedReadConfiguration>();

        return configuration;
    }

    public static IConfiguration GetIConfigurationRoot(string outputPath) {
        return new ConfigurationBuilder()
            .SetBasePath(outputPath)
            .AddJsonFile("appsettings.json")
            .Build();
    }    
}

Reference Configuration in ASP.NET Core

Reference Options pattern in ASP.NET Core

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