我嘗試創建一個 .Net 6 控制臺應用程式，但無法讀取我的 appsettings.json 檔案。在 Web 應用程式中，我可以使用它...
var builder = WebApplication.CreateBuilder(args);
但是我會在控制臺應用程式中使用什么？嘗試將其添加到 program.cs 時出現此錯誤。"The name 'WebApplication' does not exist in the current context"
uj5u.com熱心網友回復：
在您的應用程式中添加這兩個 nuget 包
Microsoft.Extensions.Configuration
Microsoft.Extensions.Configuration.Json
然后你可以使用 ConfigurationBuilder 來使用 appsettings.json 檔案
var configuration = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile($"appsettings.json");
var config = configuration.Build();
var connectionString = config["ConnectionString"];
在控制臺應用程式中從 AppSettings 獲取值
在 .net 核心應用中添加 AppSettings
uj5u.com熱心網友回復：
您可以使用 DI 獲取 IConfiguration 介面，并使用它可以訪問 appsettings。
uj5u.com熱心網友回復：
在我添加的控制臺應用程式中appsettings.json，user secrets你也可能有一個開發 json 檔案。
internal class Program
{
internal static IConfigurationRoot Configuration;
public static void Main()
=> new Program().MainAsync().GetAwaiter().GetResult();
private async Task MainAsync()
{
var configurationBuilder = new ConfigurationBuilder();
configurationBuilder.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);
configurationBuilder.AddUserSecrets(typeof(Program).GetTypeInfo().Assembly, optional: false);
Configuration = configurationBuilder.Build();
...
}
}
然后在任何類的控制臺應用程式的其他地方，您都可以像這樣簡單地呼叫它
var someSetting = Program.Configuration["SomeSetting"];
如果你想要一個強型別的類，那么請看這個答案.net core Console application strong typed Configuration on SO
uj5u.com熱心網友回復：
檔案鏈接：https ://docs.microsoft.com/en-us/dotnet/core/extensions/configuration
執行此操作所需的 Nuget 包：
<PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="6.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="6.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="6.0.0" />
使用 Microsoft.Extensions.Configuration；
// Build a config object, using env vars and JSON providers.
IConfiguration config = new ConfigurationBuilder()
.AddJsonFile("appsettings.json")
.AddEnvironmentVariables()
.Build();
// Get values from the config given their key and their target type.
Settings settings = config.GetRequiredSection("Settings").Get<Settings>();
// Write the values to the console.
Console.WriteLine($"KeyOne = {settings.KeyOne}");
Console.WriteLine($"KeyTwo = {settings.KeyTwo}");
Console.WriteLine($"KeyThree:Message = {settings.KeyThree.Message}");
// Application code which might rely on the config could start here.
// This will output the following:
// KeyOne = 1
// KeyTwo = True
// KeyThree:Message = Oh, that's nice...
JSON 檔案 (appsettings.json)
{
"Settings": {
"KeyOne": 1,
"KeyTwo": true,
"KeyThree": {
"Message": "Oh, that's nice..."
}
}
}
UPD：我檢查了方法及其作業；我的代碼：
// See https://aka.ms/new-console-template for more information
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.Json;
Console.WriteLine("Hello, World!");
ConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
IConfiguration c = configurationBuilder.AddJsonFile("appsettings.json").AddEnvironmentVariables().Build();
var k = c.GetRequiredSection("Settings").Get<Settings>().KeyOne;
var n = 1;
public class NestedSettings
{
public string Message { get; set; } = null!;
}
public class Settings
{
public int KeyOne { get; set; }
public bool KeyTwo { get; set; }
public NestedSettings KeyThree { get; set; } = null!;
}
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