[英]Query gives error: String was not recognized as a valid Boolean
我正在嘗試從具有通用存儲庫的數據庫中獲取對象。 當我執行代碼時,我收到錯誤消息:
String was not recognized as a valid Boolean.
我之前使用過帶有Single()函數的存儲庫,但這沒有給出任何錯誤。
User usr = Adapter.UserRepository.Single(u => u.userEmail.Equals("thomas.vanlauwe@gmail.com"));
public ActionResult Display()
{
Project project = new Project();
int id = 2;
project = Adapter.ProjectRepository.Single(p => p.ProjectID.Equals(id));
return View();
}
public T Single(Expression<Func<T, bool>> where)
{
try
{
IQueryable<T> query = IDbSet;
//query = PerformInclusions(includeProperties, query);
return query.Single(where);
}
catch (InvalidOperationException ex)
{
Console.WriteLine(ex);
return null;
}
}
錯誤在以下行中彈出:return query.Single(where);
public class Project
{
public Project() {
Categories = new List<Category>();
}
public int ProjectID { get; set; }
[Display(Name = "Titel")]
public string ProjectTitle { get; set; }
[Display(Name = "Beschrijving")]
public string ProjectDescription { get; set; }
[Display(Name = "Deadline")]
public Nullable<DateTime> ProjectDeadlineDate { get; set; }
[Display(Name = "End register")]
public Nullable<DateTime> ProjectEndRegisterDate { get; set; }
[Display(Name = "Budget")]
public double ProjectBudget { get; set; }
public Boolean ProjectIsFixedPrice { get; set; } //Fixed price or budget / hour
public int ProjectUrgent { get; set; }
public Int16 ProjectDifficulty { get; set; }
public Nullable<DateTime> ProjectCreatedDate { get; set; }
public Boolean ProjectFinished { get; set; }
public Int16 ProjectRating { get; set; }
public string ProjectComment { get; set; }
public int CompanyID { get; set; }
public virtual ICollection<Category> Categories { get; set; }
}
我的數據庫的ID為2,因此查詢肯定會返回一個項目對象。 我希望您有足夠的信息,如有必要,我將更新我的代碼。
提前致謝
我不知道此錯誤的原因是什么,這就是為什么我添加以下代碼,也許與映射有關:
/*************ProjectS**************/
modelBuilder.Entity<Project>().HasKey(t => t.ProjectID);
modelBuilder.Entity<Project>().HasMany(p => p.Categories)
.WithMany(cat => cat.Projects)
.Map(pc =>
{
pc.ToTable("category_has_project");
pc.MapLeftKey("project_id");
pc.MapRightKey("category_id");
}
);
public class Category
{
public int CategoryID { get; set; }
public string CategoryName { get; set; }
public virtual ICollection<Project> Projects { get; set; }
}
類型不匹配可能實際上是在數據庫中的其他字段(即ProjectID以外的其他字段)與您的Project類之間? 確保Project類中的所有屬性和數據類型與Project數據庫表字段正確匹配。
可能存在意外的不匹配,例如:Project類中的布爾字段可能在數據庫中標記為varchar字段,反之亦然。
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