c# - 从 IQueryable 出发到字符串

Question

我有一个模型，如下所示：

[Table("WebsiteText")]
public class WebsiteTextModel
{
    [Key]
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
    public int ID { get; set; }

    public string WebsiteSection { get; set; }

    [DataType(DataType.MultilineText)]
    public string TextToDisplay { get; set; }
}

我有一个 DataContext 类，如下所示：

public class WebsiteTextContext : DbContext
{
    public WebsiteTextContext()
        : base("DefaultConnection")
    {

    }

    public DbSet<WebsiteTextModel> WebsiteText { get; set; }
}

我想使用 LINQ 为我的主页获取网站文本，并将其填充到 ViewBag 中，所以我正在尝试这个：

public ActionResult Index()
{
    var context = new WebsiteTextContext();

    var result = from x in context.WebsiteText
                 where x.WebsiteSection == "Home Page"
                 select x.TextToDisplay;

    ViewBag.Message = result;

    return View();
}

但是 var 是 IQueryable，我不知道如何将其转换为字符串。这不起作用：

string result = from x in context.WebsiteText
    where x.WebsiteSection == "Home Page"
    select x.TextToDisplay;

这不起作用：

var result = from x in context.WebsiteText
    where x.WebsiteSection == "Home Page"
    select x.TextToDisplay.ToString; //It's still IQueryable<String>

这不起作用：

var result = from x in context.WebsiteText
    where x.WebsiteSection == "Home Page"
    select x.TextToDisplay.ToArray; //It's now IQueryable<char[]>

我需要做什么？

Answer 1

string result = (from x in context.WebsiteText
where x.WebsiteSection == "Home Page"
select x.TextToDisplay).FirstOrDefault();

你也有Firstand SingleandSingleOrDefault

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