asp.net - 值不能为空。参数名称 : value

Question

我想在aspnet用户表中添加新字段..我还在帐户 View 模型中添加了用户名属性..

 public class ApplicationUser : IdentityUser<int, UserLogin, UserRole, UserClaim>
{
    public DateTime? ActiveUntil;

    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(ApplicationUserManager manager)
    {
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
        return userIdentity;
    }
    public string  UserName { get; set; }

}

它给出了以下错误
值不能为空。
参数名称:值

      {
Line 53:             // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
Line 54:             var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
Line 55:             // Add custom user claims here

Answer 1

我通过在 SecurityStamp 字段中放置一个随机字符串解决了这个问题。要生成此字符串，只需使用 Guid.NewGuid ()

所以，你可以把你的代码改成这样:enter code here

public async Task<ClaimsIdentity> GenerateUserIdentityAsync(ApplicationUserManager manager)
{
    if (string.IsNullOrEmpty(this.SecurityStamp))
    {
        this.SecurityStamp = Guid.NewGuid().ToString().Replace("-", "");
    }

    var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
    return userIdentity;
}