C# 无法将lambda表达式转换为类型“DbContextOptions”,因为它不是委托类型
我创建了从类IdentityDbContext继承的类DataContext:C# 无法将lambda表达式转换为类型“DbContextOptions”,因为它不是委托类型,c#,.net-core,asp.net-identity,entity-framework-core,C#,.net Core,Asp.net Identity,Entity Framework Core,我创建了从类IdentityDbContext继承的类DataContext: using ProjDAL.Entities; using ProjDAL.Relations; using ProjDAL.Services; using Microsoft.AspNetCore.Identity.EntityFrameworkCore; using Microsoft.EntityFrameworkCore; using Microsoft.EntityFrameworkCore.Design;
using ProjDAL.Entities;
using ProjDAL.Relations;
using ProjDAL.Services;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.Extensions.Configuration;
namespace ProjDAL.EF
{
public class DataContext : IdentityDbContext<ApplicationUser>
{
public DataContext(DbContextOptions<DataContext> options) : base(options)
{
}
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
}
.......................................................
}
My Program.cs文件:
using System;
using DbInitialize.Provider;
using ProjDAL.EF;
namespace DbInitialize
{
class Program
{
private static readonly DbInitializeProvider _db;
delegate void Display();
static Program()
{
_db = new DbInitializeProvider();
}
static void Main(string[] args)
{
try
{
Display display = _db.SetCreateDatabase;
display.Invoke();
Console.WriteLine($"\r\n{new string('-', 80)}");
Console.WriteLine("For continue press any button...");
}
catch (Exception e)
{
Console.WriteLine(e);
}
Console.ReadLine();
}
}
}
I get错误:无法将lambda表达式转换为DbContextOptions类型,因为它不是委托类型创建DataContext实例和设置选项参数的正确性如何
如果你需要更多的信息,请告诉我。谢谢您的帮助。创建DataContext类时,参数与DataContext构造函数中定义的参数不匹配。它需要DbContextOptions类型的对象,但您正在提供一个带有选项参数options=>options.UseSqlServerData Source=.\\SQLEXPRESS;初始目录=ProjAppTest;综合安全=真实;MultipleActiveResultSets=true
您需要构建options对象并向构造函数提供实例:
var optionsBuilder = new DbContextOptionsBuilder<DataContext>();
optionsBuilder.UseSqlServer("YOUR CONNECTION STRING");
_db = new DataContext(optionsBuilder.Options)
或者,您也可以使用不带参数的构造函数,并在OnConfigurang方法的DataContext类中对其进行配置
请参阅此处的文档:
var optionsBuilder = new DbContextOptionsBuilder<DataContext>();
optionsBuilder.UseSqlServer("YOUR CONNECTION STRING");
_db = new DataContext(optionsBuilder.Options)