我是ASP.NET Core的新手。我正在根据官方文档构建ASP.NET Core web api试用项目。我想用这个项目设置PostgresSQL,所以我做了以下:
我的模特:
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace Api_trial.Models
{
public class Student
{
public int Id { get; set; }
public string Name { get; set; }
public int Grade { get; set; }
}
public class WebAPIDataContext : DbContext
{
public WebAPIDataContext(DbContextOptions<WebAPIDataContext> options)
: base(options)
{
}
public DbSet<Student> Students { get; set; }
}
}
appsettings.json:
{
"ConnectionStrings": {
"DataAccessPostgreSqlProvider": "User ID=postgres;Password=root;Host=localhost;Port=5432;Database=asp_trial_api;Pooling=true;"
},
"Logging": {
"IncludeScopes": false,
"LogLevel": {
"Default": "Debug",
"System": "Information",
"Microsoft": "Information"
}
}
}
startup.cs:
public void ConfigureServices(IServiceCollection services)
{
// Add framework services.
services.AddApplicationInsightsTelemetry(Configuration);
services.AddDbContext<WebAPIDataContext>(options => {
options.UseNpgsql(Configuration.GetConnectionString("DataAccessPostgreSqlProvider"));
});
services.AddMvc();
services.AddSwaggerGen();
}
我的project.json:
{
"dependencies": {
"Microsoft.NETCore.App": {
"version": "1.0.1",
"type": "platform"
},
"Microsoft.ApplicationInsights.AspNetCore": "1.0.0",
"Microsoft.AspNetCore.Mvc": "1.0.1",
"Microsoft.AspNetCore.Routing": "1.0.1",
"Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
"Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
"Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
"Microsoft.Extensions.Configuration.FileExtensions": "1.0.0",
"Microsoft.Extensions.Configuration.Json": "1.0.0",
"Microsoft.Extensions.Logging": "1.0.0",
"Microsoft.Extensions.Logging.Console": "1.0.0",
"Microsoft.Extensions.Logging.Debug": "1.0.0",
"Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0",
"Microsoft.EntityFrameworkCore": "1.0.1",
"Microsoft.EntityFrameworkCore.InMemory": "1.0.1",
"Swashbuckle": "6.0.0-beta902",
"Npgsql.EntityFrameworkCore.PostgreSQL": "1.1.0"
},
"tools": {
"Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
},
"frameworks": {
"netcoreapp1.0": {
"imports": [
"dotnet5.6",
"portable-net45+win8"
]
}
},
"buildOptions": {
"emitEntryPoint": true,
"preserveCompilationContext": true
},
"runtimeOptions": {
"configProperties": {
"System.GC.Server": true
}
},
"publishOptions": {
"include": [
"wwwroot",
"**/*.cshtml",
"appsettings.json",
"web.config"
]
},
"scripts": {
"postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
}
}
但是,我在startup.cs中遇到以下错误:
我恢复了包裹,但我基本上不确定它的真正含义和必须做的事情。我还没有执行:dotnet ef migration
答案 0 :(得分:2)
当您使用.NET Core 1.0而非.NET Core 1.1时,请降级Npgsql.EntityFrameworkCore.PostgreSQL
nuget的版本。
在project.json中使用"Npgsql.EntityFrameworkCore.PostgreSQL": "1.0.2"
代替"Npgsql.EntityFrameworkCore.PostgreSQL": "1.1.0"
。