小编Ili*_*lov的帖子

我知道你可以这样在XAML中用"*"设置行高:

 <RowDefinition Height="Auto" />
 <RowDefinition Height="*" />

但是C#中的相同表达式返回错误:

new RowDefinition { Height = new GridLength("*", GridUnitType.Auto) },

所以我的问题是如何在C#中将网格的行高设置为"*"？

是否有一种简单的方法可以隐藏ListView中的滚动条,但仍然可以滚动它？

我有以下网格,它被加载到StackLayout中:

            Grid grid = new Grid {
            VerticalOptions = LayoutOptions.FillAndExpand,
            HorizontalOptions = LayoutOptions.FillAndExpand,
            RowDefinitions = 
            {
                new RowDefinition { Height = new GridLength(40, GridUnitType.Auto) },
                new RowDefinition { Height = GridLength.Auto },
                new RowDefinition { Height = GridLength.Auto },
                new RowDefinition { Height = GridLength.Auto },
                new RowDefinition { Height = GridLength.Auto },
                new RowDefinition { Height = GridLength.Auto },
                new RowDefinition { Height = GridLength.Auto },
                new RowDefinition { Height = new GridLength(40, GridUnitType.Auto) },
            },
            ColumnDefinitions = 
            { …

我正在构建一个带有便携式类库的Android/iOS xamarin表单应用程序.我正在寻找在PCL项目中执行此示例的最佳方法:

https://msdn.microsoft.com/en-us/library/456dfw4f(v=vs.110).aspx

using System;
using System.IO;
using System.Net;
using System.Text;

namespace Examples.System.Net
{
    public class WebRequestGetExample
    {
        public static void Main ()
        {
            // Create a request for the URL. 
            WebRequest request = WebRequest.Create (
              "http://www.contoso.com/default.html");
            // If required by the server, set the credentials.
            request.Credentials = CredentialCache.DefaultCredentials;
            // Get the response.
            WebResponse response = request.GetResponse ();
            // Display the status.
           Console.WriteLine(((HttpWebResponse)response).StatusDescription);
            // Get the stream containing content returned by the server.
            Stream dataStream = response.GetResponseStream ();
            // Open …

我有以下内容页面,我想在其中加载Steema Teechart,但我不能,因为我不能使MainPage异步:

我的主页:

public class MainPage : ContentPage
{
    public MainPage (bool chart)
    {           
        ChartView chartView = new ChartView 
        { 
            VerticalOptions = LayoutOptions.FillAndExpand, 
            HorizontalOptions = LayoutOptions.FillAndExpand,
            HeightRequest = 300,
            WidthRequest = 400
        }; 

        LineModel test1 = new LineModel();
        chartView.Model = await test1.GetModel(); 

        //put the chartView in a grid and other stuff

        Content = new StackLayout { 
            HorizontalOptions = LayoutOptions.FillAndExpand,
            VerticalOptions = LayoutOptions.FillAndExpand,
            Children = {
                    grid
            }
        };
    }
}

我的LineModel类:

public class LineModel
{
        public async Task<Steema.TeeChart.Chart> GetModel () …

我需要创建一个弹出窗口，其中会有一些选项卡，每个选项卡都包含一个列表视图。我知道有一个 TabbedPage，但我需要一个“TabbedView”以便我可以使用 Xlabs PopupLayout 构建我的弹出窗口。如何在 Xamarin Forms 中执行此操作？