如何在 .net core 3.1 中使用 ConfigurationBulder 绑定到配置 class
How can I bind to a configuration class using ConfigurationBulder in .net core 3.1
我想使用 ConfigurationBuidler
来阅读我的 appsettings.json
文件。我看不出我做错了什么。
我的文件是
{
"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"
}
我的测试失败
[TestMethod]
public void TestMethod1()
{
var configuration = Helper.LoadConfiguration("appsettings.json");
Assert.IsTrue(configuration.Properties.Keys.Contains("col1Width")); // fails here
}
我的帮手class是
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;
}
}
[更新]
我根据博客 Post Marco 指出我更正了问题标题并更新了代码如下。
只有 .Bind
不可用
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; }
}
根据显示的设置文件,没有 "FeedRead"
部分
需要直接从根目录读取设置。
using Microsoft.Extensions.Configuration;
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();
}
}
(需要Microsoft.Extensions.Configuration.Binder and Microsoft.Extensions.Configuration.Json)
我想使用 ConfigurationBuidler
来阅读我的 appsettings.json
文件。我看不出我做错了什么。
我的文件是
{
"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"
}
我的测试失败
[TestMethod]
public void TestMethod1()
{
var configuration = Helper.LoadConfiguration("appsettings.json");
Assert.IsTrue(configuration.Properties.Keys.Contains("col1Width")); // fails here
}
我的帮手class是
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;
}
}
[更新]
我根据博客 Post Marco 指出我更正了问题标题并更新了代码如下。
只有 .Bind
不可用
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; }
}
根据显示的设置文件,没有 "FeedRead"
部分
需要直接从根目录读取设置。
using Microsoft.Extensions.Configuration;
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();
}
}
(需要Microsoft.Extensions.Configuration.Binder and Microsoft.Extensions.Configuration.Json)