我一直收到以下异常。这个异常让我感到困惑，因为我没有选择 UserID。
我尝试将选择更改为 SELECT * 但这只会导致 result.Count 为 0，无论数据是否存在。
我在数据库中有一个名为 bob tob 的虚拟记录。
我注意到，如果我将鼠标悬停在 db.Users.SqlQuery 的用户部分。
里面的文字是
{SELECT
[Extent1].[userID] AS [userID],
[Extent1].[userFirstName] AS [userFirstName],
[Extent1].[userLastName] AS [userLastName],
[Extent1].[userName] AS [userName],
[Extent1].[userEmail] AS [userEmail],
[Extent1].[userPassword] AS [userPassword],
[Extent1].[userStatus] AS [userStatus],
[Extent1].[userEmailVerificationStatus] AS [userEmailVerificationStatus],
[Extent1].[userActivationCode] AS [userActivationCode]
FROM [dbo].[Users] AS [Extent1]}
我猜它无论如何都会尝试选择所有用户类项目？如果那是真的那么我该如何阻止呢？我错过了什么？
这是异常(exception)情况:
The data reader is incompatible with the specified 'UserRegistrationPasswordsModel.User'. A member of the type, 'userID', does not have a corresponding column in the data reader with the same name.
下面是调用 EmailExists 的代码。我错误地添加了 ToString()，希望这可能是问题所在。
#region EmailExist
// Email already exists?
if (Utilities.EmailExists(user.userEmail.ToString()))
{
// A pretty awesome way to make a custom exception
ModelState.AddModelError("EmailExist", "Email already exists");
// Bounce back
return View(user);
}
#endregion
下面是应该检查电子邮件是否存在的过程。
#region EmailExists
// Confirm if the Email exists or not
public static bool EmailExists(string Email)
{
bool result = false;
Models.UserRegistrationPasswordsEntities1 db = new Models.UserRegistrationPasswordsEntities1();
var queryResult = db.Users.SqlQuery("SELECT userEmail FROM Users WHERE userEmail = @1;",
new SqlParameter("@1", Email)).FirstOrDefault();
// the ternary opertor is pretty awesome
result = queryResult.Result.GetType() == null ? false : true;
return result;
}
#endregion
这是表结构:
CREATE TABLE [dbo].[Users]
(
[userID] INT IDENTITY (1, 1) NOT NULL,
[userFirstName] VARCHAR (50) NOT NULL,
[userLastName] VARCHAR (50) NOT NULL,
[userName] VARCHAR (50) NOT NULL,
[userEmail] VARCHAR (50) NOT NULL,
[userPassword] VARCHAR (100) NOT NULL,
[userStatus] BIT DEFAULT ((0)) NOT NULL,
[userEmailVerificationStatus] BIT DEFAULT ((0)) NOT NULL,
[userActivationCode] UNIQUEIDENTIFIER DEFAULT (newid()) NOT NULL,
[userDateOfBirth] DATETIME NOT NULL,
PRIMARY KEY CLUSTERED ([userID] ASC)
);
这是 User 模型类:
public partial class User
{
public int userID { get; set; }
[Display(Name = "First Name")]
[DataType(DataType.Text)]
[Required(AllowEmptyStrings = false, ErrorMessage ="First name required")]
public string userFirstName { get; set; }
[Display(Name = "Last Name")]
[DataType(DataType.Text)]
[Required(AllowEmptyStrings = false, ErrorMessage = "Last name required")]
public string userLastName { get; set; }
[Display(Name = "Username")]
[DataType(DataType.Text)]
[Required(AllowEmptyStrings = false, ErrorMessage = "Username required")]
public string userName { get; set; }
[Display(Name = "Email")]
[DataType(DataType.EmailAddress)]
[Required(AllowEmptyStrings = false, ErrorMessage = "email is required")]
public string userEmail { get; set; }
[Display(Name = "Date Of Birth")]
[DataType(DataType.DateTime)]
[Required(AllowEmptyStrings = false, ErrorMessage = "Date of Birth is required")]
[DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:MM/dd/yyyy}")]
public DateTime userDateOfBirth { get; set;}
[Display(Name = "Password")]
[DataType(DataType.Password)]
[Required(AllowEmptyStrings = false, ErrorMessage = "Password is required")]
[MinLength(6, ErrorMessage = "Minimum of 6 characters required")]
public string userPassword { get; set; }
[Display(Name = "Confirm Password")]
[DataType(DataType.Password)]
[Required(AllowEmptyStrings = false, ErrorMessage = "Confirm password is required")]
[Compare("userPassword", ErrorMessage = "Confirm password and password do not match")]
public string userConfirmPassword { get; set; }
public bool userStatus { get; set; }
public bool userEmailVerificationStatus { get; set; }
public System.Guid userActivationCode { get; set; }
}
我花了 2 个小时的大部分时间试图解决这个问题。
以下是我为寻找解决方案而访问过的资源。
感谢任何帮助。
https://forums.asp.net/t/1991176.aspx?The+data+reader+is+incompatible+with+the+specified+model
Incompatible Data Reader Exception From EF Mapped Objects
The data reader is incompatible with the specified Entity Framework
What can cause an EntityCommandExecutionException in EntityCommandDefinition.ExecuteStoreCommands?
最佳答案
错误说:
A member of the type, 'userID', does not have a corresponding column in the data reader with the same name.
这意味着您的查询返回的结果与您的实体类型(用户)不匹配。事实上他们没有 - 您的查询返回单列 userEmail，而类型 User 有更多的列(包括错误消息中提到的 userID)。为什么结果应该匹配 User 类型？因为您正在通过 db.Users.SqlQuery 查询此实体。
您的查询也是错误的(因为'@1' 不是参数而是文字字符串)，但这没关系，因为无论如何您不需要在这里使用原始sql 查询。只是做:
public static bool EmailExists(string Email)
{
using (var db = new Models.UserRegistrationPasswordsEntities1()) {
return db.Users.Any(c => c.userEmail == Email);
}
}
如果你想发出任意的 sql 查询(虽然我应该再说一次，在这种情况下绝对没有理由这样做) - 使用 db.Database.SqlQuery:
using (var db = new Models.UserRegistrationPasswordsEntities1()) {
var email = db.Database.SqlQuery<string>(
"SELECT userEmail FROM Users WHERE userEmail = @email",
new SqlParameter("email", Email))
.FirstOrDefault();
...
}
关于c# - 数据读取器与指定的不兼容。在数据读取器中没有同名的对应列，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49605481/