System.InvalidCastException - 工程调试，失败在发布 [英] System.InvalidCastException - works in debug, fails at release

问题描述

UNHANDLED EXCEPTION: System.InvalidCastException: Cannot cast from source type to destination type.
06-11 19:39:01.690 I/MonoDroid(17577):   at MyApp.Inbox.CorrespondenceActivity.CorrectLinkPaths (ISpanned spanText) [0x00000] in <filename unknown>:0 

这是我收到的例外。在建设有调试配置应用程序，一切工作正常的 - 没有例外，什么都没有。有一次，我建立它发布，我得到这个例外 - 我想不通为什么，以及如何解决它。

That is the exception I'm getting. When building the application with Debug configuration, everything works alright - no exceptions, no nothing. Once I build it for release, I get this exception - and I can't figure out why, and how to fix it.

这是code调用方法CorrectLinkPaths：

This is the code that invokes the method CorrectLinkPaths:

_someTextView.SetText(CorrectLinkPaths(Html.FromHtml(_myMessage.Summary + "\n\n" + _myMessage.Body)), TextView.BufferType.Spannable);

不用多说，_myMessage.Summary美体是HTML串。

Needless to say, _myMessage.Summary and Body are HTML-strings.

我CorrectLinkPaths法看起来是这样的：

My CorrectLinkPaths-method looks like this:

private ISpanned CorrectLinkPaths(ISpanned spanText)
    {
        Object[] spans = spanText.GetSpans(0, spanText.Length(), Class.FromType(typeof (Object)));
        foreach (var s in spans)
        {
            int start = spanText.GetSpanStart(s);
            int end = spanText.GetSpanEnd(s);
            SpanTypes flags = spanText.GetSpanFlags(s);
            if (s.GetType() == typeof (URLSpan))
            {
                var urlSpan = (URLSpan) s;
                if (!urlSpan.URL.StartsWith("http"))
                {
                    if (urlSpan.URL.StartsWith("/"))
                        urlSpan = new URLSpan("http://www.mydomain.com" + urlSpan.URL);
                    else
                        urlSpan = new URLSpan("http://www.mydomain.com/" + urlSpan.URL);
                }
                ((ISpannable) spanText).RemoveSpan(s);
                ((ISpannable) spanText).SetSpan(urlSpan, start, end, flags);
            }
        }
        return spanText;
    }

没有人有任何线索，为什么调试期间工作的，但是当我尝试建立发布，以及如何解决它失败？我会非常，非常，非常感谢！

Does anyone have any clue as to why this works during debug, but fails when I try to build for release, and how to fix it? I would be very, very, very grateful!

感谢您：）

最好的问候。

推荐答案

解决方案是相当简单的。它被所述的方法的，导致错误的底部铸造

The solution was fairly simple. It was the casting at the bottom of the method that resulted in the error

((ISpannable) spanText).RemoveSpan(s);
((ISpannable) spanText).SetSpan(urlSpan, start, end, flags); 

要解决此方法必须改变为以下内容：

To work around this the method had to be changed to the following:

public ISpanned CorrectLinkPaths(ISpanned spanText)
{
    Object[] spans = spanText.GetSpans(0, spanText.Length(), Class.FromType(typeof (Object)));
    ISpannable spanned = new SpannableString(spanText);
    foreach (var s in spans)
    {
        var start = spanText.GetSpanStart(s);
        var end = spanText.GetSpanEnd(s);
        var flags = spanText.GetSpanFlags(s);

        if (s.GetType() == typeof (URLSpan))
        {
            var urlSpan = (URLSpan)s;
            if (!urlSpan.URL.StartsWith("http"))
            {
                if (urlSpan.URL.StartsWith("/"))
                    urlSpan = new URLSpan("http://www.mydomain.com" + urlSpan.URL);
                else
                    urlSpan = new URLSpan("http://www.mydomain.com/" + urlSpan.URL);
            }
            spanned.RemoveSpan(s);
            spanned.SetSpan(urlSpan, start, end, flags);
        }
    }
    return spanned;
}

这篇关于System.InvalidCastException - 工程调试，失败在发布的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！