[英]ASP.NET Core appsettings.json update in code
我目前正在使用 asp.net core v1.1 進行項目,在我的 appsettings.json 中我有:
"AppSettings": {
"AzureConnectionKey": "***",
"AzureContainerName": "**",
"NumberOfTicks": 621355968000000000,
"NumberOfMiliseconds": 10000,
"SelectedPvInstalationIds": [ 13, 137, 126, 121, 68, 29 ],
"MaxPvPower": 160,
"MaxWindPower": 5745.35
},
我也有用於存儲它們的類:
public class AppSettings
{
public string AzureConnectionKey { get; set; }
public string AzureContainerName { get; set; }
public long NumberOfTicks { get; set; }
public long NumberOfMiliseconds { get; set; }
public int[] SelectedPvInstalationIds { get; set; }
public decimal MaxPvPower { get; set; }
public decimal MaxWindPower { get; set; }
}
然后在 Startup.cs 中啟用 DI:
services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));
有沒有辦法從控制器更改和保存MaxPvPower
和MaxWindPower
?
我嘗試使用
private readonly AppSettings _settings;
public HomeController(IOptions<AppSettings> settings)
{
_settings = settings.Value;
}
[Authorize(Policy = "AdminPolicy")]
public IActionResult UpdateSettings(decimal pv, decimal wind)
{
_settings.MaxPvPower = pv;
_settings.MaxWindPower = wind;
return Redirect("Settings");
}
但它什么也沒做。
基本上你可以像這樣在IConfiguration
設置值:
IConfiguration configuration = ...
// ...
configuration["key"] = "value";
問題在於,例如JsonConfigurationProvider
沒有實現將配置保存到文件中。 正如您在源代碼中看到的那樣,它沒有覆蓋ConfigurationProvider
的 Set 方法。 (見來源)
您可以創建自己的提供程序並在那里實現保存。 此處(實體框架自定義提供程序的基本示例)是如何執行此操作的示例。
這是微軟關於 .Net Core Apps 中的配置設置的相關文章:
該頁面還有示例代碼,這也可能會有所幫助。
更新
我認為內存中提供程序和綁定到 POCO 類可能有一些用處,但不能像 OP 預期的那樣工作。
下一個選項可以是設置reloadOnChange
的參數AddJsonFile為true同時加入了配置文件並手動解析JSON配置文件和如預期更改。
public class Startup
{
...
public Startup(IHostingEnvironment env)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
.AddEnvironmentVariables();
Configuration = builder.Build();
}
...
}
...
reloadOnChange
僅在 ASP.NET Core 1.1 及更高版本中受支持。
我采用了 Qamar Zamans 代碼(謝謝)並對其進行了修改,以允許編輯大於:一個:層:深的參數。
希望它可以幫助某人,驚訝地發現這不是某個地方的圖書館功能。
public static class SettingsHelpers
{
public static void AddOrUpdateAppSetting<T>(string sectionPathKey, T value)
{
try
{
var filePath = Path.Combine(AppContext.BaseDirectory, "appsettings.json");
string json = File.ReadAllText(filePath);
dynamic jsonObj = Newtonsoft.Json.JsonConvert.DeserializeObject(json);
SetValueRecursively(sectionPathKey, jsonObj, value);
string output = Newtonsoft.Json.JsonConvert.SerializeObject(jsonObj, Newtonsoft.Json.Formatting.Indented);
File.WriteAllText(filePath, output);
}
catch (Exception ex)
{
Console.WriteLine("Error writing app settings | {0}", ex.Message);
}
}
private static void SetValueRecursively<T>(string sectionPathKey, dynamic jsonObj, T value)
{
// split the string at the first ':' character
var remainingSections = sectionPathKey.Split(":", 2);
var currentSection = remainingSections[0];
if (remainingSections.Length > 1)
{
// continue with the procress, moving down the tree
var nextSection = remainingSections[1];
SetValueRecursively(nextSection, jsonObj[currentSection], value);
}
else
{
// we've got to the end of the tree, set the value
jsonObj[currentSection] = value;
}
}
在運行時更新 ASP.NET Core 中的appsettings.json
文件。
以這個示例appsettings.json
文件為例:
{
Config: {
IsConfig: false
}
}
這是將IsConfig
屬性更新為 true 的代碼:
Main()
{
AddOrUpdateAppSetting("Config:IsConfig", true);
}
public static void AddOrUpdateAppSetting<T>(string key, T value)
{
try
{
var filePath = Path.Combine(AppContext.BaseDirectory, "appSettings.json");
string json = File.ReadAllText(filePath);
dynamic jsonObj = Newtonsoft.Json.JsonConvert.DeserializeObject(json);
var sectionPath = key.Split(":")[0];
if (!string.IsNullOrEmpty(sectionPath))
{
var keyPath = key.Split(":")[1];
jsonObj[sectionPath][keyPath] = value;
}
else
{
jsonObj[sectionPath] = value; // if no sectionpath just set the value
}
string output = Newtonsoft.Json.JsonConvert.SerializeObject(jsonObj, Newtonsoft.Json.Formatting.Indented);
File.WriteAllText(filePath, output);
}
catch (ConfigurationErrorsException)
{
Console.WriteLine("Error writing app settings");
}
}
public static void SetAppSettingValue(string key, string value, string appSettingsJsonFilePath = null)
{
if (appSettingsJsonFilePath == null)
{
appSettingsJsonFilePath = System.IO.Path.Combine(System.AppContext.BaseDirectory, "appsettings.json");
}
var json = System.IO.File.ReadAllText(appSettingsJsonFilePath);
dynamic jsonObj = Newtonsoft.Json.JsonConvert.DeserializeObject<Newtonsoft.Json.Linq.JObject>(json);
jsonObj[key] = value;
string output = Newtonsoft.Json.JsonConvert.SerializeObject(jsonObj, Newtonsoft.Json.Formatting.Indented);
System.IO.File.WriteAllText(appSettingsJsonFilePath, output);
}
根據 Qamar Zaman 和 Alex Horlock 的代碼,我對其進行了一些更改。
public static class SettingsHelpers
{
public static void AddOrUpdateAppSetting<T>(T value, IWebHostEnvironment webHostEnvironment)
{
try
{
var settingFiles = new List<string> { "appsettings.json", $"appsettings.{webHostEnvironment.EnvironmentName}.json" };
foreach (var item in settingFiles)
{
var filePath = Path.Combine(AppContext.BaseDirectory, item);
string json = File.ReadAllText(filePath);
dynamic jsonObj = Newtonsoft.Json.JsonConvert.DeserializeObject(json);
SetValueRecursively(jsonObj, value);
string output = Newtonsoft.Json.JsonConvert.SerializeObject(jsonObj, Newtonsoft.Json.Formatting.Indented);
File.WriteAllText(filePath, output);
}
}
catch (Exception ex)
{
throw new Exception($"Error writing app settings | {ex.Message}", ex);
}
}
private static void SetValueRecursively<T>(dynamic jsonObj, T value)
{
var properties = value.GetType().GetProperties();
foreach (var property in properties)
{
var currentValue = property.GetValue(value);
if (property.PropertyType.IsPrimitive || property.PropertyType == typeof(string) || property.PropertyType == typeof(decimal))
{
if (currentValue == null) continue;
try
{
jsonObj[property.Name].Value = currentValue;
}
catch (RuntimeBinderException)
{
jsonObj[property.Name] = new JValue(currentValue);
}
continue;
}
try
{
if (jsonObj[property.Name] == null)
{
jsonObj[property.Name] = new JObject();
}
}
catch (RuntimeBinderException)
{
jsonObj[property.Name] = new JObject(new JProperty(property.Name));
}
SetValueRecursively(jsonObj[property.Name], currentValue);
}
}
}
假設 appsettings.json 有一個 eureka 端口,並且想要在 args (-p 5090) 中動態更改它。 通過這樣做,可以在創建許多服務時輕松更改 docker 的端口。
"eureka": {
"client": {
"serviceUrl": "http://10.0.0.101:8761/eureka/",
"shouldRegisterWithEureka": true,
"shouldFetchRegistry": false
},
"instance": {
"port": 5000
}
}
public class Startup
{
public static string port = "5000";
public Startup(IConfiguration configuration)
{
configuration["eureka:instance:port"] = port;
Configuration = configuration;
}
public static void Main(string[] args)
{
int port = 5000;
if (args.Length>1)
{
if (int.TryParse(args[1], out port))
{
Startup.port = port.ToString();
}
}
}
我正在使用我自己的配置部分和我自己的強類型對象。 我總是用這個強類型對象注入 IOptions。 而且我可以在運行時更改配置。 對對象的范圍要非常小心。 請求范圍的對象獲取新的配置值。 我正在使用構造函數注入。
雖然這方面的文檔非常不清楚..我不確定這是否意味着。 閱讀此深入討論
我解決這個問題的方法是添加一個存儲在內存緩存中的“覆蓋”屬性。 例如,我的應用程序在“appSettings.json”文件中有一個“CacheEnabled”設置,用於確定是否緩存數據查詢結果。 在應用程序/數據庫測試期間,有時需要將此屬性設置為“false”。
通過管理員菜單,管理員可以覆蓋“CacheEnabled”設置。 決定是否啟用緩存的邏輯首先檢查覆蓋。 如果它沒有找到覆蓋值,則它使用“appSettings.json”值。
鑒於實現它所需的額外基礎設施,這對很多人來說可能不是一個好的解決方案。 然而,我的應用程序已經有一個緩存服務和一個管理員菜單,所以它很容易實現。
在我的項目中,我以這種方式使用 Active Directory 設置:
//...
public class Startup
{
public void ConfigureServices(IServicesCollection services)
{
//...
services.Configure<Ldap>(opts=> {
opts.Url = "example.com";
opts.UseSsl = true;
opts.Port = 111;
opts.BindDn = "CN=nn,OU=nn,OU=nn,DC=nn,DC=nn";
opts.BindCredentials = "nn";
opts.SearchBase = "DC=nn,DC=nn";
opts.SearchFilter = "(&(objectClass=User){0})";
opts.AdminCn = "CN=nn,OU=nn,OU=nn,DC=nn,DC=nn";
opts.SearchGroupBase = "OU=nn,DC=nn,DC=nn";
});
//...
}
}
所以,不使用 appsettings.json。
之后,我可以從控制器更新此設置:
//...
[HttpPost("setActiveDirectorySettings")]
public ActionResult<IOptions<Ldap>> SetActiveDirectorySettings(ActiveDirectorySettings clientActiveDirectorySettings)
{
LdapOptions.Value.Url = clientActiveDirectorySettings.Url;
LdapOptions.Value.UseSsl = clientActiveDirectorySettings.UseSsl;
LdapOptions.Value.Port = clientActiveDirectorySettings.Port;
LdapOptions.Value.BindDn = clientActiveDirectorySettings.BindDn;
LdapOptions.Value.BindCredentials = clientActiveDirectorySettings.BindCredentials;
LdapOptions.Value.SearchBase = clientActiveDirectorySettings.SearchBase;
LdapOptions.Value.SearchFilter = clientActiveDirectorySettings.SearchFilter;
LdapOptions.Value.AdminCn = clientActiveDirectorySettings.AdminCn;
LdapOptions.Value.SearchGroupBase = clientActiveDirectorySettings.SearchGroupBase;
return Ok(LdapOptions.Value);
}
//...
看起來它對我有用
基於@Alper Ebicoglu 的回答
得到:
// ===== || GET || GET appsettings.js property =====================================================================
[HttpGet]
[Route("GetNotificationDays")]
public async Task<IActionResult> GetNotificationDays()
{
var path = System.IO.Path.Combine(Directory.GetCurrentDirectory(), "appsettings.json");
var json = await System.IO.File.ReadAllTextAsync(path);
dynamic jsonObj = Newtonsoft.Json.JsonConvert.DeserializeObject<Newtonsoft.Json.Linq.JObject>(json);
return StatusCode(200, new { daysBefore = (int)jsonObj.InvoicementNotificationSettings.DaysBefore});
}
(int)jsonObj.InvoicementNotificationSettings.DaysBefore =
(int) = 轉換為 int - 取決於屬性
jsonObj = appsettings.js,
InvoicementNotificationSettings = appsettings.js 中的對象,
DaysBefore = InvoicementNotificationSettings 中的屬性
更新:appsettings.js
// ===== || PUT || UPDATE appsettings.js property =====================================================================
[HttpPut]
[Route("SetNotificationDays")]
public async Task<IActionResult> SetNotificationDays(int notificationDays)
{
if (notificationDays != 0)
{
var path = System.IO.Path.Combine(Directory.GetCurrentDirectory(), "appsettings.json");
var json = await System.IO.File.ReadAllTextAsync(path);
dynamic jsonObj = Newtonsoft.Json.JsonConvert.DeserializeObject<Newtonsoft.Json.Linq.JObject>(json);
jsonObj.InvoicementNotificationSettings.DaysBefore = notificationDays;
string output = Newtonsoft.Json.JsonConvert.SerializeObject(jsonObj, Newtonsoft.Json.Formatting.Indented);
await System.IO.File.WriteAllTextAsync(path, output);
return await GetNotificationDays();
}
return StatusCode(409);
}
如果從內存中讀取 appsettings:例如: int daysBefore = configuration.GetValue<int>("InvoicementNotificationSettings:DaysBefore");
比在 Startup.js - 更新后自動重新加載 appsettings.js
public class Startup
{
public static IConfiguration Configuration { get; set; }
// Constructor -----------------------------------------------------------------------------------------------------------------------------
public Startup(IConfiguration configuration, Microsoft.Extensions.Hosting.IHostEnvironment env)
{
Configuration = configuration;
// To autoreload appsettings.js after update -------------------------
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
.AddEnvironmentVariables();
Configuration = builder.Build();
}
appsettings.js
{
"ConnectionStrings": {
"DefaultConnection": "Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=ItlCrmsDb;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"
},
"InvoicementNotificationSettings": {
"DaysBefore": 4
},
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*"
}
在運行時修改 appsettings.json 有一個更簡單的答案。
var filePath = Path.Combine(System.AppContext.BaseDirectory, "appSettings.json");
string jsonString = System.IO.File.ReadAllText(filePath);
//use https://json2csharp.com/ to create the c# classes from your json
Root root = JsonSerializer.Deserialize<Root>(jsonString);
var dbtoadd = new Databas()
{
Id = "myid",
Name = "mynewdb",
ConnectionString = ""
};
//add or change anything to this object like you do on any list
root.DatabaseSettings.Databases.Add(dbtoadd);
//serialize the new updated object to a string
string towrite = JsonSerializer.Serialize(root);
//overwrite the file and it wil contain the new data
System.IO.File.WriteAllText(filePath, towrite);
我看到大多數答案都使用Newtonsoft.Json
包來更新設置。 如果您需要更新一層深的設置,您可以不使用Newtonsoft.Json
並使用System.Text.Json
(內置於 .Net Core 3.0 及更高版本)功能。 這是一個簡單的實現:
public void UpdateAppSetting(string key, string value)
{
var configJson = File.ReadAllText("appsettings.json");
var config = JsonSerializer.Deserialize<Dictionary<string, object>>(configJson);
config[key] = value;
var updatedConfigJson = JsonSerializer.Serialize(config, new JsonSerializerOptions { WriteIndented = true });
File.WriteAllText("appsettings.json", updatedConfigJson);
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.