我有一个事件对象......
public class BeforeEvntDrawArgs
{
/// <summary>
/// Event html.
/// </summary>
internal string InnerHTML
{
get
{
return this.Html;
}
set
{
this.Html = value;
}
}
/// <summary>
/// Event tags, using Data TagFields.
/// </summary>
public Gamex.TagCollection Tag
{
get;
private set;
}
/// <summary>
/// Event text.
/// </summary>
public string Text
{
get;
private set;
}
/// <summary>
/// Event Clue.
/// </summary>
public string HoverOver
{
get;
set;
}
internal BeforeEvntDrawArgs(Event e, string[] fields)
{
this.Id = e.Id;
this.Text = e.Text;
if (e.Tags != null)
{
this.Tag = new Gamex.TagCollection(fields, new List<string>(e.Tags));
}
}
}
在尝试冒泡活动并复制详细信息时,我收到错误18使用未分配的本地变量&#39; beforeEntDrawArg&#39;
如果我指定null BeforeEvntDrawArgs beforeEvntDrawArg = null;
,那么它编译得很好,因为应用程序炸弹说null ref
。不确定我做错了什么,你能帮我纠正这段代码吗?
但是在我复制和初始化时的事件正文中,我做错了什么,为什么我在编译时得到一个未初始化的,如果我使用null,为什么它会在运行时中断?请让我知道如何解决这个问题..
private BeforeEvntDrawArgs DoBeforeEvntDraw(Event e)
{
// Issue begins here, and pre-initializing to null compiles,
// however breaks on runtime as a null ref
BeforeEvntDrawArgs beforeEvntDrawArg = new BeforeEvntDrawArgs(e, this.TagFields)
{
HoverOver = Encoder.HtmlEncode(beforeEvntDrawArg.Text),
InnerHtml = Encoder.HtmlEncode(beforeEvntDrawArg.Text)
};
this.OnBeforeEvntDraw(beforeEvntDrawArg);
return beforeEvntDrawArg;
}
错误18使用未分配的本地变量&#39; beforeEvntDrawArg&#39;
答案 0 :(得分:1)
您正尝试在其自己的对象初始值设定项中使用beforeEvntDrawArg。这不受支持。 https://msdn.microsoft.com/en-us/library/bb397680.aspx
试试这个。没有对象初始化语法,它完全一样。
BeforeEvntDrawArgs beforeEvntDrawArg = new BeforeEvntDrawArgs(e, this.TagFields)
beforeEvntDrawArg.HoverOver = Encoder.HtmlEncode(beforeEvntDrawArg.Text);
beforeEvntDrawArg.InnerHtml = Encoder.HtmlEncode(beforeEvntDrawArg.Text);
答案 1 :(得分:1)
我没有看到你发布的课程中的任何地方(BeforeEvntDrawArgs )一个带有2个参数的构造函数的定义。这意味着唯一可用的构造函数将是默认的无参数构造函数。所以当你试图执行
时HoverOver = Encoder.HtmlEncode(beforeEvntDrawArg.Text)
beforeEvntDrawArg.Text尚未分配值。