在 Url.action 中将字符串值作为参数传递

Question

我正在使用asp.net mvc 4 和EF6 开发一个网站。我想在Url.action 链接中将字符串值作为参数传递。但是，每当我点击链接时，我都会收到此错误：

参数类型“Edm.Int32”和“Edm.String”不兼容此操作。在 WHERE 谓词附近，第 1 行，第 76 列。

这是创建它的代码：

控制器

public ActionResult Edit(string EditId)
{
    if (Session["username"] != null)
    {
        UserInfo uinfo = db.UserInfoes.Find(EditId);
        return View(uinfo);
    }
    else
    {
        return RedirectToAction("HomeIndex");
    }
}

查看

<a class="btn btn-info" 
 href="@Url.Action("Edit", "Home", new { EditId = item.regno.ToString() })"><b>Edit</b></a>

如何使用字符串值作为参数？

Answer 1

public ActionResult Edit(string EditId)
    {
        if (Session["username"] != null)
        {
            int id;
            //Check try to parse the string into an int if it fails it will return false if it was parsed it will return true
            bool result = Int32.TryParse(EditId, out id);
            if (result)
            {                    
                 //I wouldn't use find unless you're 100% sure that record will always be there.
                 //This will return null if it cannot find your userinfo with that ID
                 UserInfo uinfo = db.UserInfoes.FirstOrDefault(x=>x.ID == id);      
                 //Check for null userInfo    
            return View(uinfo);
        }
        else
        {
            return RedirectToAction("HomeIndex");
        }
    }