首先,我有一个转发器,我正在输出一个属性.我试过了两个
<%#Eval("Link")%>
Run Code Online (Sandbox Code Playgroud)
和
<%#DataBinder.Eval(Container.DataItem, "Link")%>
Run Code Online (Sandbox Code Playgroud)
我有一个简单的课程
public class NewsItem
{
public string Link = "";
public string Title = "";
}
Run Code Online (Sandbox Code Playgroud)
我用一个简单的for each填充List新闻,然后......
repeater.DataSource = news;
repeater.DataBind();
Run Code Online (Sandbox Code Playgroud)
我得到"DataBinding:'index + NewsItem'不包含名为'Link'的属性
我正在构建一个ASP.NET C#网站,我有一个下拉列表,我绑定到我创建的对象列表.绑定下拉列表的代码如下所示:
protected void PopulateDropdownWithObjects(DropDownList dropdownlist, List<myObject>() myObjects)
{
dropdownlist.DataValueField = "ID";
dropdownlist.DataTextField = "Name";
dropdownlist.DataSource = myObjects; // my code fails here
dropdownlist.DataBind();
}
Run Code Online (Sandbox Code Playgroud)
但是,当它遇到方法中的第3行时,会抛出异常:
DataBinding: 'myObject' does not contain a property with the name 'ID'.
Run Code Online (Sandbox Code Playgroud)
但是,我可以在调试时清楚地看到myObject.ID值:我可以在立即窗口中访问它,它是公共的,它不是空的,我拼写正确并且使用正确的大小写:
public class myObject
{
public int ID; // see? "ID" is right here!
public string Name;
public myObject(
int id,
string name
)
{
this.ID = id;
this.Name = name;
}
}
Run Code Online (Sandbox Code Playgroud)
还有什么可以导致此错误吗?
新的 html5 规范有一个window.sessionStorage和window.localStorage。是window.sessionStorage持久保存到磁盘还是仅在浏览器应用程序打开时保存在内存中?
谢谢
我正在构建一个允许用户使用其Active Directory帐户登录的网站,我想告知用户他们的登录失败的原因.
登录通常会因错误的用户名/密码而失败,但由于过期密码或其帐户被锁定,它们也可能会失败.
我正在使用此代码执行登录:
public myCustomUserClass Login(string domainName, string username, string password)
{
string domainAndUsername = domainName + @"\" + username;
DirectoryEntry entry = new DirectoryEntry(this._ldapPath, domainAndUsername, password);
myCustomUserClass user = new myCustomUserClass();
//Bind to the native AdsObject to force authentication.
try
{
object obj = entry.NativeObject;
// ...
return user;
}
catch (DirectoryServicesCOMException ex)
{
// why did the login fail?
}
catch (Exception ex)
{
// something else went wrong
}
}
Run Code Online (Sandbox Code Playgroud)
当我收到a时DirectoryServicesCOMException,我可以访问有关该 …
考虑以下类:
public abstract class Planet
{
protected abstract Material Composition { get; }
}
public abstract class TerrestrialPlanet : Planet
{
protected override Material Composition
{
get
{
return Type.Rocky;
}
}
}
public abstract class GasGiant : Planet
{
protected override Material Composition
{
get
{
return Type.Gaseous;
}
}
}
Run Code Online (Sandbox Code Playgroud)
有没有办法阻止非抽象对象直接从类继承Planet?
换句话说,我们可以强制执行任何直接继承的类Planet是抽象的吗?
// ok, because it doesn't directly inherit from Planet
public class Earth : TerrestrialPlanet { ... }
// ok, because it is …Run Code Online (Sandbox Code Playgroud)