无法确定条件表达式的类型,因为'lambda expression'和'lambda expression'之间没有隐式转换
说什么?有人可以向我解释这个编译错误吗?这是产生它的代码:
protected override Func<System.IO.Stream> GetStream()
{
return someBool
? () => EmbeddedResourceExtractor.GetFile("SomeFile1.ext")
: () => EmbeddedResourceExtractor.GetFile("SomeFile2.ext");
}
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这不是:
protected override Func<System.IO.Stream> GetStream()
{
return () => EmbeddedResourceExtractor.GetFile("SomeFile1.ext");
}
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这两个都没有:
protected override Func<System.IO.Stream> GetStream()
{
if(someBool)
return () => EmbeddedResourceExtractor.GetFile("SomeFile1.ext");
return () => EmbeddedResourceExtractor.GetFile("SomeFile2.ext");
}
Run Code Online (Sandbox Code Playgroud) 当我尝试从照片库中读取图像时,我收到错误消息"超过最多5个过滤的专辑列表试图注册.这将失败." 图像未读取.
知道如何解决这个问题吗?
我使用Cordova构建了一个iOS应用程序.该应用程序尝试在index.html中加载网页,例如http://yourdomain.com/home.但是,该页面在控制台"内部导航被拒绝 - <allow-navigation>未设置为url =' http://yourdomain.com/home '" 时出现错误并且出现错误.
我已经设置<access origin="http://yourdomain.com/home" subdomains="true" />并尝试设置<allow-navigation>标签.但页面保持空白.我错过了什么吗?请指导.
在index.html中添加以下元标记后,"内部导航错误"已经消失,但页面仍为空白.:(
<meta http-equiv="Content-Security-Policy" content="default-src *; style-src 'self' 'unsafe-inline'; script src: 'self' 'unsafe-inline' 'unsafe-eval'">
Run Code Online (Sandbox Code Playgroud) 我服务器的响应如下:
[{"coreGoalId":1,"title":"Core goal 1","infrastructure":"Sample Infrastructure","audience":"People","subGoals":null,"benefits":[{"benefitId":1,"what":"string","coreGoalId":1}],"effects":null,"steps":null,"images":[{"imagelId":1,"base64":"/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcU\nFhYaHSUfGhsjHBYWICwgIyYnKSopGR8tMC0oMCUoKSj/2wBDAQcHBwoIChMKChMoGhYaKCgoKCgo\nKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCj/wgARCAIWAe4DASIA\nAhEBAxEB/8QAHAABAAIDAQEB"}]}]
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我正在尝试显示其中返回的base64图像.
在我的组件中:
ngOnInit() {
this.homeService.getGoals()
.subscribe(
goals => this.coreGoals = goals,
error => this.errorMessage = <any>error);
}
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然后在模板中:
<ul>
<li *ngFor="let goal of coreGoals">
{{goal.title}}
<img [src]="'data:image/jpg;base64,'+goal.images[0].base64 | safeHtml" />
</li>
</ul>
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safeHtml是我创建的管道,如下所示:
import { Pipe } from '@angular/core';
import { DomSanitizer } from '@angular/platform-browser';
@Pipe({name: 'safeHtml'})
export class SafeHtml {
constructor(private sanitizer:DomSanitizer){}
transform(html) {
return this.sanitizer.bypassSecurityTrustHtml(html);
}
}
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这给了我Required a safe URL, got a HTML错误.这里出了什么问题?如果我从那里删除管道<img />它说不安全的网址.
编译我的Latex文件时出现以下错误:
!LaTeX错误:无法确定tree.jpg中的图形大小(无BoundingBox).
为什么我会收到此错误?这与.eps文件有什么关系?
事实上,我可以在我的机器上用MacTex编译好.但是,当我在线提交给科学期刊进行发布时,它会在服务器上编译它并向我发送所有这些错误的PDF,以防止它编译.
我使用以下语法来包含图像:
\begin{figure}[!h]
\begin{center}
\scalebox{0.45}{
\includegraphics{tree.jpg}}
\end{center}
\caption{\small A sample}
\label{tree}
\end{figure}
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我该怎么办 ?可能是他们的服务器使用旧的编译器?
更新:它终于奏效了.我将第一张图片转换为PDF格式,编辑完美无缺.我猜它使用了该PDF的边界框值并将其应用于所有图像.
我在eclipse中点击更新,我得到一个错误,这是因为我不止一次更新了eclipse.有没有办法修复eclipse并有能力使用更新?
An error occurred while collecting items to be installed No repository found containing: org.eclipse.jem/osgi.bundle/2.0.202.v200810282000 No repository found containing: org.eclipse.jem.workbench/osgi.bundle/2.0.102.v200810230530 No repository found containing: org.eclipse.jpt.core/osgi.bundle/2.1.0.v200812160210 No repository found containing: org.eclipse.jpt.doc.user/osgi.bundle/1.0.300.v200812110000 No repository found containing: org.eclipse.jpt.eclipselink.core/osgi.bundle/1.1.0.v200812110000 No repository found containing: org.eclipse.jpt.eclipselink.core.ddlgen/osgi.bundle/1.0.100.v200811030000 No repository found containing: org.eclipse.jpt.eclipselink.feature/org.eclipse.update.feature/2.1.0.v200812180210-318Y9oA55S8_795555 No repository found containing: org.eclipse.jpt.eclipselink.ui/osgi.bundle/1.1.0.v200812100000 No repository found containing: org.eclipse.jpt.feature/org.eclipse.update.feature/2.1.0.v200812180210-7979AgCYQCD4IRJdCEDC No repository found containing: org.eclipse.jpt.ui/osgi.bundle/2.1.0.v200812080000 No repository found containing: org.eclipse.jst.common.frameworks/osgi.bundle/1.1.201.v200810161330 No repository found containing: org.eclipse.jst.ejb.doc.user/osgi.bundle/1.1.100.v200810092245 No repository found containing: org.eclipse.jst.ejb.ui/osgi.bundle/1.1.203.v200810010400 No repository found containing: org.eclipse.jst.enterprise_core.feature/org.eclipse.update.feature/3.0.3.v200810010400-42E_4_kE77c_FAP7X99 …
如何在bootstrap 3中制作流体容器?
在bootstrap 2.3.2 .container-fluid中有类.但现在在bootstrap 3中它缺失了,只有.container类.请帮我.
在我的ViewController.m文件中的当前项目中,我正在运行该方法:
[[connection writer] writeData: data];
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它返回警告:
warning: multiple methods named 'writeData:' found
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我试图调用该方法:
- (void) writeData: (NSData*)data
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...在TCPWriter.m中.不幸的是,还有另外两种writeData方法
- (void)writeData:(NSData *)data;
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...在NSFileHandle.h和......
- (BOOL)writeData:(NSData *)data
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......在NSURLHandle.h.这对我来说尤其令人困惑,因为[conn writer]应该返回TCPWriter类,该类应该调用正确的writeData方法.此外,我甚至不完全确定NSFileHandle.h和NSURLHandle.h甚至包含在ViewController.h中包含的任何库中,而不是包含在项目的不同部分中.
如何向编译器显示writeData我想要调用的方法以及为什么会发生此错误?
我有一段这样的代码:
int main (int argc, char *argv[])
{
printf("%d\t",(int)argv[1]);
printf("%s\t",(int)argv[1]);
}
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在shell中我这样做:
./test 7
但是第一个printf结果不是7,我怎样才能将argv []作为int?非常感谢
我正在使用C#将消息写入消息队列,如下所示:
queue.Send(new Message("message"));
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我正在尝试阅读如下消息:
Messages messages = queue.GetAllMessages();
foreach(Message m in messages)
{
String message = m.Body;
//do something with string
}
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但是我收到一条错误消息,上面写着:"找不到能够读取此消息的格式化程序."
我究竟做错了什么?