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Martin Hope
GBM
Asked: 2025-02-27 00:01:35 +0800 CST
  • 5

我正在开发 Maui 应用程序并想添加图表，因此我安装了 Syncfusion.Maui.Charts NuGet 包。问题是，在代码隐藏中，我在定义图表的框架中收到以下错误；

Severity    Code    Description Project File    Line    Suppression State
Error (active)  XFC0000 Cannot resolve type "clr-namespace:Syncfusion.Maui.Charts;assembly=Syncfusion.Maui.Charts:sfChart:BarSeries".   MauiApp1 (net8.0-android), MauiApp1 (net8.0-ios), MauiApp1 (net8.0-maccatalyst), MauiApp1 (net8.0-windows10.0.19041.0)  C:\Users\44751\source\repos\MauiApp1\MainPage.xaml  24  
Error   XLS0414 The type 'sfChart:BarSeries' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built.   MauiApp1    C:\Users\44751\source\repos\MauiApp1\MainPage.xaml  24

我可以确认该包确实出现在解决方案资源管理器中的依赖项下，并尝试卸载/重新安装并删除 bin 和 object 文件夹并更改命名空间，但尽管一切看起来都很好，但似乎没有任何效果。我决定做基础工作，创建一个新的简单项目并安装 Syncfusion.Maui.Charts 包，但尽管我保持了它的简单性，但还是出现了同样的问题。以下是MainPage.xaml.cs;

using Syncfusion.Maui.Charts;
using Syncfusion.Maui.Core.Hosting;


namespace MauiApp1
{
    public partial class MainPage : ContentPage
    {
        public ObservableCollection<SalesData> SalesDataCollection { get; set; }

        public MainPage()
        {
            InitializeComponent();
            SalesDataCollection = new ObservableCollection<SalesData>
                {
                    new SalesData("Product A", 120),
                    new SalesData("Product B", 180),
                    new SalesData("Product C", 90),
                };

            BindingContext = this; // ✅ Set BindingContext
        }


    }

}

以下是MainPage.xaml;

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:sfChart="clr-namespace:Syncfusion.Maui.Charts;assembly=Syncfusion.Maui.Charts"
             x:Class="MauiApp1.MainPage">

    <VerticalStackLayout Padding="20">

        <Label Text="Syncfusion Chart Test" 
               FontSize="24" 
               HorizontalOptions="Center" 
               VerticalOptions="Start" />

        <sfChart:SfCartesianChart HorizontalOptions="FillAndExpand"
                                  VerticalOptions="FillAndExpand">
            <sfChart:SfCartesianChart.XAxes>
                <sfChart:CategoryAxis Title="Products"/>
            </sfChart:SfCartesianChart.XAxes>

            <sfChart:SfCartesianChart.YAxes>
                <sfChart:NumericalAxis Title="Sales"/>
            </sfChart:SfCartesianChart.YAxes>

            <sfChart:SfCartesianChart.Series>
                <sfChart:BarSeries ItemsSource="{Binding SalesDataCollection}"
                                   XBindingPath="ProductName"
                                   YBindingPath="SalesAmount"
                                   ShowDataLabels="True"/>
            </sfChart:SfCartesianChart.Series>

        </sfChart:SfCartesianChart>
    </VerticalStackLayout>

</ContentPage>

错误发生在 .xaml 的第 24 行，即<sfChart:BarSeries ItemsSource="{Binding SalesDataCollection}“sfChart:BarSeries”部分中的“ ”。

MauiProgram.cs 文件如下所示；

using Microsoft.Extensions.Logging;
using Syncfusion.Maui.Core.Hosting;

namespace MauiApp1
{
    public static class MauiProgram
    {
        public static MauiApp CreateMauiApp()
        {
            var builder = MauiApp.CreateBuilder();
            builder
                .UseMauiApp<App>()
                .ConfigureSyncfusionCore()  // ✅ Ensure this line is added
                .ConfigureFonts(fonts =>
                {
                    fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
                    fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
                });
            //builder.ConfigureSyncfusionCore(); // ✅ Register Syncfusion

#if DEBUG
            builder.Logging.AddDebug();
#endif

            return builder.Build();
        }
    }
}

作为参考，MauiApp1.csproj 文件如下所示；

<Project Sdk="Microsoft.NET.Sdk">

    <PropertyGroup>
        <TargetFrameworks>net8.0-android;net8.0-ios;net8.0-maccatalyst;</TargetFrameworks>
        <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net8.0-windows10.0.19041.0</TargetFrameworks>
        <!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
        <!-- <TargetFrameworks>$(TargetFrameworks);net8.0-tizen</TargetFrameworks> -->

        <!-- Note for MacCatalyst:
        The default runtime is maccatalyst-x64, except in Release config, in which case the default is maccatalyst-x64;maccatalyst-arm64.
        When specifying both architectures, use the plural <RuntimeIdentifiers> instead of the singular <RuntimeIdentifier>.
        The Mac App Store will NOT accept apps with ONLY maccatalyst-arm64 indicated;
        either BOTH runtimes must be indicated or ONLY macatalyst-x64. -->
        <!-- For example: <RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers> -->

        <OutputType>Exe</OutputType>
        <RootNamespace>MauiApp1</RootNamespace>
        <UseMaui>true</UseMaui>
        <SingleProject>true</SingleProject>
        <ImplicitUsings>enable</ImplicitUsings>
        <Nullable>enable</Nullable>

        <!-- Display name -->
        <ApplicationTitle>MauiApp1</ApplicationTitle>

        <!-- App Identifier -->
        <ApplicationId>com.companyname.mauiapp1</ApplicationId>

        <!-- Versions -->
        <ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>
        <ApplicationVersion>1</ApplicationVersion>

        <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">11.0</SupportedOSPlatformVersion>
        <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">13.1</SupportedOSPlatformVersion>
        <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">21.0</SupportedOSPlatformVersion>
        <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</SupportedOSPlatformVersion>
        <TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</TargetPlatformMinVersion>
        <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
    </PropertyGroup>

    <ItemGroup>
        <!-- App Icon -->
        <MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />

        <!-- Splash Screen -->
        <MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#512BD4" BaseSize="128,128" />

        <!-- Images -->
        <MauiImage Include="Resources\Images\*" />
        <MauiImage Update="Resources\Images\dotnet_bot.png" Resize="True" BaseSize="300,185" />

        <!-- Custom Fonts -->
        <MauiFont Include="Resources\Fonts\*" />

        <!-- Raw Assets (also remove the "Resources\Raw" prefix) -->
        <MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
    </ItemGroup>

    <ItemGroup>
        <PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
        <PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="$(MauiVersion)" />
        <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="8.0.0" />
        <PackageReference Include="Syncfusion.Maui.Charts" Version="28.2.7" />
    </ItemGroup>



</Project>

我完全搞不懂为什么会收到此错误。我已附上解决方案资源管理器中依赖项的屏幕截图，并可以确认包名称出现在每个 .net8.0 的“包”节点下； 依赖项截图

maui
Martin Hope
GBM
Asked: 2023-12-22 01:22:40 +0800 CST
  • 6

我正在尝试使用任一列表中的程序引用字段来加入 Linq 中的两个程序列表 - 列表 A 中的引用有时可能会在其末尾附加“-R”，并且可能会在列表中出现两次（一次带有“-R”，并且再次没有），而列表 B 中的引用根本不会附加“-R”。

在列表 A 中，如前所述，每个记录有两行，并且我收到“长度不能小于零”。错误。下面是我的代码；

例子有：

ListA
UG00001-2023
UG00001-2023-R
UG00002-2023
UG00002-2023-R

List B
UG00001-2023
UG00002-2023

var combinedList = from programmeA in ListA join programmeB in ListB on (programmeA?.REFERENCE.Substring(0,programmeA.REFERENCE.IndexOf("-R")) ?? programmeA.REFERENCE) equals programmeB?.REFERENCE ?? string.Empty
select new Programme()
{
...
}

所以，我想要实现的是，如果列表 A 中的程序引用中的一行在引用末尾附加了“-R”，则返回“-R”之前的所有内容，但如果程序引用没有附加“-R”，然后按原样返回引用。

任何帮助，将不胜感激。

c#