如何立即更新 .NET Core 3.1 的配置文件以实现高效配置管理？
摘要：``` public class Startup { private ConfigurationReloadToken _changeToken = new ConfigurationReloadToken(); private byte[
public class Startup
{
private ConfigurationReloadToken _changeToken = new ConfigurationReloadToken();
private byte[] _configFileHash = new byte[20];
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public void ConfigureServices(IServiceCollection services)
{
...
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IConfiguration config)
{
ChangeToken.OnChange(
() => config.GetReloadToken(),
() =>
{
byte[] configFileHash = ComputeHash("appSettings.json");
if (!_configFileHash.SequenceEqual(configFileHash))
{
Log.Information("Configuration changed");
_configFileHash = configFileHash;
}
var previousToken =
Interlocked.Exchange(ref _changeToken, new ConfigurationReloadToken());
previousToken.OnReload();
});
}
private byte[] ComputeHash(string file)
{
if (File.Exists(file))
{
using (var fs = File.OpenRead(file))
{
return System.Security.Cryptography.SHA1.Create().ComputeHash(fs);
}
}
else
{
return new byte[20];
}
}
}