MVC ||不能应用于'bool'和& # 39;字符串# 39;

本文关键字：字符串 不能 应用于 bool MVC | 更新日期: 2023-09-27 18:11:25

我想通过FirstName或Lastname进行搜索。我希望列表显示搜索为空时的每条记录。我遇到了一个错误'|不能应用于'bool'和'string'类型的操作数'。

这是索引控制器

 [Authorize(Users="aaron")]
public class personController : Controller
{
    private dumb_so_dumbEntities db = new dumb_so_dumbEntities();
    // GET: /person/
    public ActionResult Index(string searchBy, string search)
    {
        if (searchBy == "FirstName")
        {
            return View(db.Persons.Where(x => x.FirstName.StartsWith(search) || search == null).ToList());
        }
        else
        {
            return View(db.Persons.Where(x => x.LastName.StartsWith(search) || search == null).ToList());
        }
    }

还有，我还有一个问题。如果我想添加额外的搜索函数，但它是一个int(name as P_Id)我如何在一个动作中把这三个(一个int和两个string)放在一起?我确实试过做一个

else if (searchBy == "P_Id")

它反作用为不能将int转换为string。

MVC ||不能应用于'bool'和& # 39;字符串# 39;

try:

public ActionResult Index(string searchBy, string search)
    {
        if (searchBy == "FirstName")
        {
            return View((from o in db.Persons Where o.LastName.StartsWith(search) select o).ToList());
        }
        else
        {
         //if searchBy not "FirstName" including null then select all data..
          return View((from o in db.Persons select o).ToList());
        }
    }

: 

string myValue="your_value";
return View((from o in db.Persons Where (o.LastName.StartsWith(search)) || (o.Name==myValue) select o).ToList());

试试Contains:

[Authorize(Users="aaron")]
public class personController : Controller 
{
    private dumb_so_dumbEntities db = new dumb_so_dumbEntities();
// GET: /person/
    public ActionResult Index(string searchBy, string search)
    {
        if (searchBy == "FirstName")
        {
            return View(db.Persons.Where(x => x.FirstName.Contains(search) || search == null).ToList();
        }
        else
        {
            return View(db.Persons.Where(x => x.LastName.Contains(search) || search == null).ToList();
        }
    }
}
编辑:

对于第二个问题，您可以像这样将ints转换为strings:

string convertedInteger = intToConvert.ToString();

然后做ìf比较

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