前言：在與傳統的asp.net MVC專案相比,.net core專案在專案目錄的檔案結構上和功能上與前者都有很大的區別。例如：在.net core中使用Startup.cs取代Global.asax檔案用於載入應用程式的設定和各種啟動項目。 appsettings.json取代web.config檔案用於儲存應用程式所需的設定參數等等。 。 。
OK！步入正題,下面來說一下如何讀取Json設定檔中的參數。
第一種:使用IConfiguration介面
我們先在appsettings.json中設定好資料庫連接字串,然後讀取它
{
"Connection": {
"dbContent": "Data Source=.;Initial Catalog=test;User ID=sa;Password=123456"
},
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*"
}登入後複製
# 在控制器中註入IConfiguration介面
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
namespace Read.json.Controllers
{
[ApiController]
[Route("[controller]")]
public class ReadController : Controller
{
private IConfiguration _configuration;
public ReadController(IConfiguration configuration)
{
_configuration = configuration;
}
[HttpPost]
public async Task<string> ReadJson()
{
//读参
string conn = _configuration["Connection:dbContent"];
return "";
}
}
}</string>登入後複製
當然也可以讀取數組形式的json,一樣的先在appsettings.json中寫好設定參數，如下：
{
"Connection": {
"dbContent": "Data Source=.;Initial Catalog=test;User ID=sa;Password=123456"
},
//------------------------
"Content": [
{
"Trade_name": {
"test1": "小熊饼干",
"test2": "旺仔QQ糖",
"test3": "娃哈哈牛奶"
}
}
],
//------------------------
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*"
}登入後複製
例如我們想讀取test1
string commodity_test1 = _configuration["Content:0:Trade_name:test1"];
登入後複製
第二種：使用IOptions來讀取json設定檔
先把NuGet套件導進專案：Microsoft.Extensions.Options.ConfigurationExtensions
{
"Connection": {
"dbContent": "Data Source=.;Initial Catalog=test;User ID=sa;Password=123456"
},
//------------------------
"Content": [
{
"Trade_name": {
"test1": "小熊饼干",
"test2": "旺仔QQ糖",
"test3": "娃哈哈牛奶"
}
}
],
//------------------------
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*",
//==============================
"Information": {
"school": {
"Introduce": {
"Name": "实验小学",
"Class": "中班",
"Number": "15人"
},
"Region": {
"Province": "湖北",
"City": "武汉",
"Area": "洪山区"
},
"Detailed_address": [
{
"Address": "佳园路207号"
}
]
}
}
//==============================
}登入後複製
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# 在Startup中加入如下程式碼
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace Read.json
{
public class Information
{
public School school { get; set; }
}
public class School
{
public Introduce Introduce { get; set; }
public Region Region { get; set; }
public List<detailed_address> data { get; set; }
}
public class Introduce
{
public string Name { get; set; }
public string Class { get; set; }
public string Number { get; set; }
}
public class Region
{
public string Province { get; set; }
public string City { get; set; }
public string Area { get; set; }
}
public class Detailed_address
{
public string Address { get; set; }
}
}</detailed_address>登入後複製
控制器中使用：
#region 服务注册,在控制器中通过注入的形式使用
services.AddOptions();
services.Configure<information>(Configuration.GetSection("Information")); #endregion</information>登入後複製
#第三種：這種應該比較常見,任意讀取自訂的json檔案
先建立一個json檔案
{
"Connection": {
"dbContent": "Data Source=.;Initial Catalog=test;User ID=sa;Password=123456"
},
//------------------------
"Content": [
{
"Trade_name": {
"test1": "小熊饼干",
"test2": "旺仔QQ糖",
"test3": "娃哈哈牛奶"
}
}
],
//------------------------
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*",
//==============================
"Information": {
"school": {
"Introduce": {
"Name": "实验小学",
"Class": "中班",
"Number": "15人"
},
"Region": {
"Province": "湖北",
"City": "武汉",
"Area": "洪山区"
},
"Detailed_address": [
{
"Address": "佳园路207号"
}
]
}
}
//==============================
}登入後複製
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#再建立一個類別,封裝一個方法
{
"system_version": {
"Edition": ".Net Core 3.0",
"Project_Name": "Read.json"
}
}登入後複製
#在控制器中呼叫：
using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace Read.json
{
public class Json_File
{
public IConfigurationRoot Read_Json_File()
{
//这句代码会读取read_json.json中的内容
return new ConfigurationBuilder().AddJsonFile("read_json.json")
.Build();
}
}
}登入後複製
#
## 本文來自
C#.Net教學
欄目，歡迎學習！
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