C# Azure功能：如何在运行时读取host.json中的设置？_C#_Azure_Azure Functions_Settings

C# Azure功能：如何在运行时读取host.json中的设置？

c# azure azure-functions

C# Azure功能：如何在运行时读取host.json中的设置？,c#,azure,azure-functions,settings,C#,Azure,Azure Functions,Settings,有没有办法在运行时读取host.json文件中的主机设置？假设您有这样一个主机文件： { “版本”：“2.0”， “扩展”：{ “服务总线”：{ “messageHandlerOptions”：{ “maxConcurrentCalls”：16 } } } } 然后如何从C代码中读取maxConcurrentCalls设置如果默认值也包括在内，则更可取。您应该在启动时获得与控制台中打印的值相同的值： [28-01-2020 09:16:06] LoggerFilterOptions [28

有没有办法在运行时读取host.json文件中的主机设置？假设您有这样一个主机文件：

{
“版本”：“2.0”，
“扩展”：{
“服务总线”：{
“messageHandlerOptions”：{
“maxConcurrentCalls”：16
}
}
}
}

然后如何从C代码中读取

maxConcurrentCalls

设置

如果默认值也包括在内，则更可取。您应该在启动时获得与控制台中打印的值相同的值：

[28-01-2020 09:16:06] LoggerFilterOptions
[28-01-2020 09:16:06] {
[28-01-2020 09:16:06]   "MinLevel": "None",
[28-01-2020 09:16:06]   "Rules": [
[28-01-2020 09:16:06]     {
[28-01-2020 09:16:06]       "ProviderName": null,
[28-01-2020 09:16:06]       "CategoryName": null,
[28-01-2020 09:16:06]       "LogLevel": null,
[28-01-2020 09:16:06]       "Filter": "<AddFilter>b__0"
[28-01-2020 09:16:06]     },
[28-01-2020 09:16:06]     {
[28-01-2020 09:16:06]       "ProviderName": "Microsoft.Azure.WebJobs.Script.WebHost.Diagnostics.SystemLoggerProvider",
[28-01-2020 09:16:06]       "CategoryName": null,
[28-01-2020 09:16:06]       "LogLevel": "None",
[28-01-2020 09:16:06]       "Filter": null
[28-01-2020 09:16:06]     },
[28-01-2020 09:16:06]     {
[28-01-2020 09:16:06]       "ProviderName": "Microsoft.Azure.WebJobs.Script.WebHost.Diagnostics.SystemLoggerProvider",
[28-01-2020 09:16:06]       "CategoryName": null,
[28-01-2020 09:16:06]       "LogLevel": null,
[28-01-2020 09:16:06]       "Filter": "<AddFilter>b__0"
[28-01-2020 09:16:06]     }
[28-01-2020 09:16:06]   ]
[28-01-2020 09:16:06] }
[28-01-2020 09:16:06] FunctionResultAggregatorOptions
[28-01-2020 09:16:06] {
[28-01-2020 09:16:06]   "BatchSize": 1000,
[28-01-2020 09:16:06]   "FlushTimeout": "00:00:30",
[28-01-2020 09:16:06]   "IsEnabled": true
[28-01-2020 09:16:06] }
[28-01-2020 09:16:06] SingletonOptions
[28-01-2020 09:16:06] {
[28-01-2020 09:16:06]   "LockPeriod": "00:00:15",
[28-01-2020 09:16:06]   "ListenerLockPeriod": "00:00:15",
[28-01-2020 09:16:06]   "LockAcquisitionTimeout": "10675199.02:48:05.4775807",
[28-01-2020 09:16:06]   "LockAcquisitionPollingInterval": "00:00:05",
[28-01-2020 09:16:06]   "ListenerLockRecoveryPollingInterval": "00:01:00"
[28-01-2020 09:16:06] }
[28-01-2020 09:16:06] ServiceBusOptions
[28-01-2020 09:16:06] {
[28-01-2020 09:16:06]   "PrefetchCount": 0,
[28-01-2020 09:16:06]   "MessageHandlerOptions": {
[28-01-2020 09:16:06]     "AutoComplete": true,
[28-01-2020 09:16:06]     "MaxAutoRenewDuration": "00:05:00",
[28-01-2020 09:16:06]     "MaxConcurrentCalls": 192
[28-01-2020 09:16:06]   },
[28-01-2020 09:16:06]   "SessionHandlerOptions": {
[28-01-2020 09:16:06]     "AutoComplete": true,
[28-01-2020 09:16:06]     "MaxAutoRenewDuration": "00:05:00",
[28-01-2020 09:16:06]     "MaxConcurrentSessions": 2000,
[28-01-2020 09:16:06]     "MessageWaitTimeout": "00:01:00"
[28-01-2020 09:16:06]   },
[28-01-2020 09:16:06]   "BatchOptions": {
[28-01-2020 09:16:06]     "MaxMessageCount": 1000,
[28-01-2020 09:16:06]     "OperationTimeout": "00:01:00",
[28-01-2020 09:16:06]     "AutoComplete": true
[28-01-2020 09:16:06]   }
[28-01-2020 09:16:06] }
[28-01-2020 09:16:06] HttpOptions
[28-01-2020 09:16:06] {
[28-01-2020 09:16:06]   "DynamicThrottlesEnabled": false,
[28-01-2020 09:16:06]   "MaxConcurrentRequests": -1,
[28-01-2020 09:16:06]   "MaxOutstandingRequests": -1,
[28-01-2020 09:16:06]   "RoutePrefix": "api"
[28-01-2020 09:16:06] }

[28-01-2020 09:16:06]日志过滤器选项
[28-01-2020 09:16:06] {
[28-01-2020 09:16:06]“最低水平”：“无”，
[28-01-2020 09:16:06]“规则”：[
[28-01-2020 09:16:06]     {
[28-01-2020 09:16:06]“ProviderName”：空，
[28-01-2020 09:16:06]“CategoryName”：空，
[28-01-2020 09:16:06]“日志级别”：空，
[28-01-2020 09:16:06]“过滤器”：“b__0”
[28-01-2020 09:16:06]     },
[28-01-2020 09:16:06]     {
[28-01-2020 09:16:06]“ProviderName”：“Microsoft.Azure.WebJobs.Script.WebHost.Diagnostics.SystemLoggerProvider”，
[28-01-2020 09:16:06]“CategoryName”：空，
[28-01-2020 09:16:06]“日志级别”：“无”，
[28-01-2020 09:16:06]“过滤器”：空
[28-01-2020 09:16:06]     },
[28-01-2020 09:16:06]     {
[28-01-2020 09:16:06]“ProviderName”：“Microsoft.Azure.WebJobs.Script.WebHost.Diagnostics.SystemLoggerProvider”，
[28-01-2020 09:16:06]“CategoryName”：空，
[28-01-2020 09:16:06]“日志级别”：空，
[28-01-2020 09:16:06]“过滤器”：“b__0”
[28-01-2020 09:16:06]     }
[28-01-2020 09:16:06]   ]
[28-01-2020 09:16:06] }
[28-01-2020 09:16:06]功能结果向导选项
[28-01-2020 09:16:06] {
[28-01-2020 09:16:06]“批量大小”：1000，
[28-01-2020 09:16:06]“刷新超时”：“00:00:30”，
[28-01-2020 09:16:06]“IsEnabled”：正确
[28-01-2020 09:16:06] }
[28-01-2020 09:16:06]单音选项
[28-01-2020 09:16:06] {
[28-01-2020 09:16:06]“锁定期”：“00:00:15”，
[28-01-2020 09:16:06]“ListenerLockPeriod”：“00:00:15”，
[28-01-2020 09:16:06]“锁获取超时”：“10675199.02:48:05.4775807”，
[28-01-2020 09:16:06]“LockAcquisitionPollingInterval”：“00:00:05”，
[28-01-2020 09:16:06]“ListenerLockRecoveryPollingInterval”：“00:01:00”
[28-01-2020 09:16:06] }
[28-01-2020 09:16:06]服务总线选项
[28-01-2020 09:16:06] {
[28-01-2020 09:16:06]“预取计数”：0，
[28-01-2020 09:16:06]“MessageHandlerOptions”：{
[28-01-2020 09:16:06]“自动完成”：正确，
[28-01-2020 09:16:06]“最大持续时间”：“00:05:00”，
[28-01-2020 09:16:06]“MaxConcurrentCalls”：192
[28-01-2020 09:16:06]   },
[28-01-2020 09:16:06]“会话句柄选项”：{
[28-01-2020 09:16:06]“自动完成”：正确，
[28-01-2020 09:16:06]“最大持续时间”：“00:05:00”，
[28-01-2020 09:16:06]“MaxConcurrentSessions”：2000，
[28-01-2020 09:16:06]“消息等待超时”：“00:01:00”
[28-01-2020 09:16:06]   },
[28-01-2020 09:16:06]“批量选项”：{
[28-01-2020 09:16:06]“MaxMessageCount”：1000，
[28-01-2020 09:16:06]“操作超时”：“00:01:00”，
[28-01-2020 09:16:06]“自动完成”：正确
[28-01-2020 09:16:06]   }
[28-01-2020 09:16:06] }
[28-01-2020 09:16:06]HttpOptions
[28-01-2020 09:16:06] {
[28-01-2020 09:16:06]“DynamicThrottlesEnabled”：错误，
[28-01-2020 09:16:06]“MaxConcurrentRequests”：-1，
[28-01-2020 09:16:06]“MaxOutstandingRequests”：-1，
[28-01-2020 09:16:06]“RoutePrefix”：“api”
[28-01-2020 09:16:06] }

这就是你想要的吗

根据您的需求，我认为您可以设计一个函数来读取和解析json值。我想您知道host.json文件的格式是固定的，因此我可以在这里给出一个简单的示例：

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Text;

namespace HttpTrigger
{
    public static class Function1
    {
        public static string GetFileJson(string filepath)
        {
            string json = string.Empty;
            using (FileStream fs = new FileStream(filepath, FileMode.Open, System.IO.FileAccess.Read, FileShare.ReadWrite))
            {
                using (StreamReader sr = new StreamReader(fs, Encoding.GetEncoding("utf-8")))
                {
                    json = sr.ReadToEnd().ToString();
                }
            }
            return json;
        }
        //Read Json Value
        public static string ReadJson()
        {
            string jsonfile = "host.json";
            string jsonText = GetFileJson(jsonfile);
            JObject jsonObj = JObject.Parse(jsonText);
            string value = ((JObject)jsonObj["extensions"])["serviceBus"]["messageHandlerOptions"]["maxConcurrentCalls"].ToString();
            return value;
        }
        [FunctionName("Function1")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            string value = ReadJson();

            log.LogInformation("C# HTTP trigger function processed a request.");

            string name = req.Query["name"];

            string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
            dynamic data = JsonConvert.DeserializeObject(requestBody);
            name = name ?? data?.name;

            return name != null
                ? (ActionResult)new OkObjectResult($"Hello, {name}")
                : new BadRequestObjectResult("Please pass a name on the query string or in the request body" + value);
        }
    }
}

使用系统；
使用System.IO；
使用System.Threading.Tasks；
使用Microsoft.AspNetCore.Mvc；
使用Microsoft.Azure.WebJobs；
使用Microsoft.Azure.WebJobs.Extensions.Http；
使用Microsoft.AspNetCore.Http；
使用Microsoft.Extensions.Logging；
使用Newtonsoft.Json；
使用Newtonsoft.Json.Linq；
使用系统文本；
命名空间HttpTrigger
{
公共静态类函数1
{
公共静态字符串GetFileJson（字符串文件路径）
{
string json=string.Empty；
使用（FileStream fs=newfilestream（filepath，FileMode.Open，System.IO.FileAccess.Read，FileShare.ReadWrite））
{
使用（StreamReader sr=newstreamreader（fs，Encoding.GetEncoding（“utf-8”））
{
json=sr.ReadToEnd（）.ToString（）；
}
}
返回json；
}
//读取Json值
公共静态字符串ReadJson（）
{
字符串jsonfile=“host.json”；
字符串jsonText=GetFileJson（jsonfile）；
JObject jsonObj=JObject.Parse（jsonText）；
字符串值=（（JObject）jsonObj[“扩展”]）[“服务总线”][“messageHandlerOptions”][“maxConcurrentCalls”]。ToString（）；
返回值；
}
[功能名称（“功能1”）]
公共静态异步任务运行(
[HttpTrigger（AuthorizationLevel.Function，“get”，“post”，Route=null）]HttpRequest请求，
ILogger日志）
{
字符串值=ReadJson（）；
LogInformation（“C#HTTP触发器函数处理了一个请求。”）；
字符串名称=请求查询[“名称”]；
string requestBody=等待新的StreamReader（req.Body）.ReadToEndAsync（）；
动态数据=JsonConvert.DeserializeObject（requestBody）；
名称=名称？？数据？.name；
返回名称！=null
？（ActionResult）新的OkObjectResult（$“你好，{name}”）
：new BadRequestObjectResult（“请在查询字符串或请求正文中传递名称”+值）；
}
}
}

结果：

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Text;

namespace HttpTrigger
{
    public static class Function1
    {
        public static string GetFileJson(string filepath)
        {
            string json = string.Empty;
            using (FileStream fs = new FileStream(filepath, FileMode.Open, System.IO.FileAccess.Read, FileShare.ReadWrite))
            {
                using (StreamReader sr = new StreamReader(fs, Encoding.GetEncoding("utf-8")))
                {
                    json = sr.ReadToEnd().ToString();
                }
            }
            return json;
        }
        //Read Json Value
        public static string ReadJson()
        {
            string jsonfile = "host.json";
            string jsonText = GetFileJson(jsonfile);
            JObject jsonObj = JObject.Parse(jsonText);
            string value = ((JObject)jsonObj["extensions"])["serviceBus"]["messageHandlerOptions"]["maxConcurrentCalls"].ToString();
            return value;
        }
        [FunctionName("Function1")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            string value = ReadJson();

            log.LogInformation("C# HTTP trigger function processed a request.");

            string name = req.Query["name"];

            string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
            dynamic data = JsonConvert.DeserializeObject(requestBody);
            name = name ?? data?.name;

            return name != null
                ? (ActionResult)new OkObjectResult($"Hello, {name}")
                : new BadRequestObjectResult("Please pass a name on the query string or in the request body" + value);
        }
    }
}

您可以看到，我在host.json中获得了maxConcurrentCalls的值。Azure函数b上方的函数部分