我想以编程方式配置wpf网格.
我希望能够设置一个包含2列的网格,第一列占用可用空间的20%,第二列占80%.在xaml中我会使用*运算符,但我无法解决如何以编程方式执行此操作.
在Xaml我会这样做:
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition width="20*" />
<ColumnDefinition width="80*" />
</Grid>
在我想要的代码中:
Grid grid = new Grid();
grid.ColumnDefinitions.Add( new ColumnDefinition(20*) );
grid.ColumnDefinitions.Add( new ColumnDefinition(80*) );
请有人建议.
我是android开发和android studio IDE的新手.
我从bitbucket检出了一个项目,当我尝试编译它时,我收到以下错误:
无法完成Gradle执行
原因:打开zip文件时出错.
我的gradle-wrapper.properties情况如下:
distributionBase = GRADLE_USER_HOME
distributionPath = wrapper/dists
zipStoreBase = GRADLE_USER_HOME
zipStorePath = wrapper/dists
distributionUrl = http \://services.gradle.org/distributions/gradle-1.11-all.zip
我无法从此获取太多信息,但完整日志指出:
2014-05-23 14:06:28,950 [32077] WARN - nal.AbstractExternalSystemTask - 原因:打开zip文件时出错com.intellij.openapi.externalSystem.model.ExternalSystemException:原因:在org.jetbrains打开zip文件时出错. plugins.gradle.service.project.GradleExecutionHelper.execute(GradleExecutionHelper.java:206)在org.jetbrains.plugins.gradle.service.project.GradleProjectResolver.resolveProjectInfo(GradleProjectResolver.java:116)在org.jetbrains.plugins.gradle. com.intellij.openapi.externalSystem.service.remote上的com.intellij.openapi.externalSystem.service.remote.RemoteExternalSystemProjectResolverImpl $ 1.produce(RemoteExternalSystemProjectResolverImpl.java:41)中的service.project.GradleProjectResolver.resolveProjectInfo(GradleProjectResolver.java:64) .RemoteExternalSystemProjectResolverImpl $ 1.produce(RemoteExternalSystemProjectResolverImpl.java:37)at com.intellij.openapi.externalSystem.service.remote.AbstractRemoteExternalSystemService.execute(AbstractRemoteExternalSystemService.jav)一:59)在com.intellij.openapi.externalSystem.service.remote.RemoteExternalSystemProjectResolverImpl.resolveProjectInfo(RemoteExternalSystemProjectResolverImpl.java:37)在com.intellij.openapi.externalSystem.service.remote.wrapper.ExternalSystemProjectResolverWrapper.resolveProjectInfo(ExternalSystemProjectResolverWrapper.java: 49)在com.intellij.openapi.externalSystem.service.internal.ExternalSystemResolveProjectTask.doExecute(ExternalSystemResolveProjectTask.java:48)在com.intellij.openapi.externalSystem.service.internal.AbstractExternalSystemTask.execute(AbstractExternalSystemTask.java:137)在玉米.intellij.openapi.externalSystem.service.internal.AbstractExternalSystemTask.execute(AbstractExternalSystemTask.java:123)在com.intellij.openapi.externalSystem.util.ExternalSystemUtil $ 3.execute(ExternalSystemUtil.java:467)在com.intellij.openapi. externalSystem.util.ExternalSystemUtil $ 4 $ 2.run(ExternalSystemUtil.java:546)at com.intellij.openapi.progress.impl.ProgressManagerImpl $ TaskRunnabl e.run(ProgressManagerImpl.java:464)在com.intellij.openapi.progress.impl.ProgressManagerImpl $ 2.run(ProgressManagerImpl.java:178)在com.intellij.openapi.progress.ProgressManager.executeProcessUnderProgress(ProgressManager.java:209 )在com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:212)在com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:171)在com.intellij.openapi. progress.impl.ProgressManagerImpl $ 8.run(ProgressManagerImpl.java:373)at com.intellij.openapi.application.impl.ApplicationImpl $ 8.run(ApplicationImpl.java:419)at java.util.concurrent.Executors $ RunnableAdapter.call( Executors.java:511)在java.util.concurrent.FutureTask.run(FutureTask.java:266)在java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)在java.util.concurrent.ThreadPoolExecutor中的$工人.run(ThreadPoolExecutor.java:617)位于com.intellij.openapi.app的java.lang.Thread.run(Thread.java:745)lication.impl.ApplicationImpl $ 1 $ 1.run(ApplicationImpl.java:149)
2014-05-23 14:06:28,950 [32077] WARN - .project.GradleProjectImporter - 2014-05-23 14:06:28,951 …
我正在开发一个WCF服务,我对它的配置消耗有点困惑.
我的主机应用程序(控制台应用程序)和我的WCF服务项目(随模板附带)中有app.config文件
在运行时,我可以看到使用两个文件的配置.
它是如何工作的？为什么WCF库项目(一个DLL项目)包含一个app.config文件,它的目的是什么？
我真的可以对此进行一些澄清......
更新
这是来自主机应用程序中app.config的WCF配置
<system.serviceModel>
<!-- services -->
<services>
<service name="Services.CalcService">
<endpoint address="net.tcp://localhost:8412/MyCalcService"
binding="netTcpBinding"
bindingConfiguration="MyNetTcpBinding"
contract="Contracts.ICalc"/>
</service>
</services>
<!-- bindings -->
<bindings>
<netTcpBinding>
<binding name="MyNetTcpBinding"
closeTimeout="00:01:00"
openTimeout="00:01:00"
receiveTimeout="00:10:00"
sendTimeout="00:01:00"
transactionFlow="false"
transferMode="Streamed"
transactionProtocol="OleTransactions"
hostNameComparisonMode="StrongWildcard"
listenBacklog="10"
maxBufferPoolSize="524288"
maxBufferSize="65536"
maxConnections="10"
maxReceivedMessageSize="65536">
<readerQuotas maxDepth="32"
maxStringContentLength="8192"
maxArrayLength="16384"
maxBytesPerRead="4096"
maxNameTableCharCount="16384" />
<reliableSession ordered="true"
inactivityTimeout="00:10:00"
enabled="false" />
<security mode="Transport">
<transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" />
</security>
</binding>
</netTcpBinding>
</bindings>
</system.serviceModel>
这是我的WCF服务库中的WCF配置
<system.serviceModel>
<services>
<service name="Services.CalcService">
<endpoint address="" binding="basicHttpBinding" contract="Contracts.ICalc">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
<endpoint …我正在寻找一种方法来显示DataGrid编译时未知类型的数据.
我有以下基类
public abstract class Entity
{
// Some implementation of methods ...
}
在运行时,我加载一个插件DLL并使用反射来获取从中派生的所有类型的列表Entity.例如:
public class A : Entity
{
public LocalAddress Address{ get; set; }
}
public class B : Entity
{
public Vendor Vendor { get; set; }
public string Name { get; set; }
}
然后我从DB中检索了他们的实例列表
public IEnumerable<Entity> Entities { get; set; } // A list of instances of type A for example
Entities是DataGrid的ItemsSource,但是什么是我可以将属性绑定到的最佳方式DataGrid？由于属性可能很复杂,我还需要能够绑定到特定路径,例如Address.HomeNum......
我正在调查一些代码并遇到一个包含DataGrid一些带有绑定列的xaml :
Binding="{Binding calc_from}" ....
我到处搜索,但没有包含名为的属性的类calc_from.然后我偶然发现了一些PropertyDescriptor课程.我认为这是他们如何使绑定工作,但没有完全理解如何.
什么是PropertyDescriptor有益的？我什么时候想实现自己的CustomTypeDescriptor？它与WPF绑定机制有何关系？
我已经在这个帖子中找到了一个例子,但是如果有人能够对它有所了解,我会很高兴
我正在开发基于PRISM框架(Unity Container)的WPF 4.0-MVVM应用程序.
我想知道在mvvm模式中实现对话框的最佳方法是什么.我打算在我的应用程序中使用很多,所以我想要一些可重用的东西.
嗨,我有一个MediaElement,DataTemplate但我无法从后面的代码访问它.
我发布下面的xaml代码:
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="605*"/>
<ColumnDefinition Width="151*"/>
</Grid.ColumnDefinitions>
<GroupBox Header="My Videos" Height="177" VerticalAlignment="Top" Margin="5,320,5,0" Grid.ColumnSpan="2">
<ListBox x:Name="VideoList" ItemsSource="{Binding Videos }" Width="auto" Height=" auto" Margin="0,0,0,0" Grid.ColumnSpan="2" >
<DataTemplate x:Name="DTVideos">
<ListBoxItem Name="lbivid1" BorderThickness="2" Width="240" Selected="lbivid_Selected" >
<MediaElement Name="vidList" Height="150" Width="150" Source="{Binding SourceUri}" Position="00:00:05" LoadedBehavior="Pause" ScrubbingEnabled="True"/>
</ListBoxItem>
</DataTemplate>
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" Margin="0,0,0,0"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ListBox>
</GroupBox>
<GroupBox Header="Preview" Height="320" Width="400" VerticalAlignment="Top" DockPanel.Dock="Left">
<MediaElement x:Name="videoPreview" HorizontalAlignment="Left" Height="300" VerticalAlignment="Top" Width="388"/>
</GroupBox>
代码背后:
private void lbivid_Selected(object sender, RoutedEventArgs e)
{ …请考虑以下代码段:
public void Do()
{
....
Task.Delay(5000).ContinueWith(t => DoSomething());
....
}
假设该Do方法在Delay任务完成之前完成执行且DoSomething不可取消.
对于Task返回的ContinueWith方法没有维护引用这一事实会导致某种内存泄漏吗？
我有一个表格连接到模型NgModel如下:
<form #orderForm="ngForm" (ngSubmit)="onSubmit(orderForm)">
<ion-list class="contact_view">
<ion-item>
<ion-label stacked>{{ 'ADDRESS_LINE_1' | translate }}</ion-label>
<ion-input type="text" required placeholder="{{ 'ADDRESS_LINE_1_PLACEHOLDER' | translate }}" clearInput="true" name="addressLineOne" [(ngModel)]="order.addressLineOne"></ion-input>
</ion-item>
<ion-item>
<ion-label stacked>{{ 'ADDRESS_LINE_2' | translate }}</ion-label>
<ion-input type="text" placeholder="{{ 'ADDRESS_LINE_2_PLACEHOLDER' | translate }}" clearInput="true" name="addressLineTwo" [(ngModel)]="order.addressLineTwo"></ion-input>
</ion-item>
....
....
....
</ion-list>
</form>
当我将它用作从视图到模型的一个方向绑定时,这对我来说效果很好.
现在,我希望能够从代码更新输入值,如下所示:
ionViewDidEnter() {
// attempt to load order from memory
this.storageService
.get<Order>(StorageKeys.ShippingDetails)
.then(order => {
// if order was loaded
if (order) {
// test
this.order.addressLineOne = "aaaa"; // …我最近开始探索WPF中的数据和UI虚拟化功能,偶然发现了一些奇怪的东西.
我创建了一个DataGrid"s的Virtualizing启用和一个有1,000,000项的列表填充它.这种方法效果非常好而且速度惊人.
<Grid>
<DataGrid x:Name="employees" VirtualizingPanel.IsVirtualizing="True"
VirtualizingPanel.IsContainerVirtualizable="True"
VirtualizingPanel.VirtualizationMode="Recycling"/>
</Grid>
但是,当我把它嵌入它下载StackPanel超过一分钟直到我得到OutOfMemoryException.我也设置了相同的VirtualizingPanel属性,StackPanel但它没有帮助.
这种行为是故意还是我错过了一些基本的东西？我如何设法在嵌套控件中支持数据虚拟化？