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xamarin形成了如何从代码隐藏中填充picker

picker xamarin.forms c#

0

John · 技术社区 · 5 年前

晚上好,

正在学习Xamarin表单..尝试添加具有数值的选取器…(使用 https://docs.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/picker/populating-itemssource

<---XAML--->
      <Picker Grid.Column="4"  Grid.Row="2" ItemsSource="{Binding pickerSource}"/>

<---c#---->
         var pickerList = new List<string>();
                pickerList.Add("1");
                pickerList.Add("2");
                pickerList.Add("3");
                pickerList.Add("4");
                pickerList.Add("5");
                pickerList.Add("6");
                pickerList.Add("7");
                pickerList.Add("8");
                pickerList.Add("9");
                pickerList.Add("10");

                var pickerSource = new Picker { Title = "Quantity", TitleColor = Color.Red };
                pickerSource.ItemsSource = pickerList;

谢谢你

另外…如果有人知道一个包含所有数值的工具,而不是我手动用1、2、3等填充它,那就作为旁注。。

再次感谢

---xaml公司--

<Picker Grid.Column="4"  Grid.Row="2" ItemsSource="{Binding pickerSource}"/>

---c级#----

public List<string> pickerSource { get; set; }

 public void PopulateQuantityPicker()
        {
            var pickerList = new List<string>();
            pickerList.Add("1");
            pickerList.Add("2");
            pickerList.Add("3");
            pickerList.Add("4");
            pickerList.Add("5");
            pickerList.Add("6");
            pickerList.Add("7");
            pickerList.Add("8");
            pickerList.Add("9");
            pickerList.Add("10");

            pickerSource = pickerList;

            this.BindingContext = this;
}

选取器在应用程序上,但未填充,为空。

(代码也正在命中PopulateQuantityPicker())

0 回复 | 直到 5 年前

1

0

Jason 5 年前

您正在将ItemsSource绑定到 pickerSource

<Picker Grid.Column="4"  Grid.Row="2" ItemsSource="{Binding pickerSource}"/>

在你的代码背后,你需要一个 公共财产 命名 . 你只能绑定到 公共财产

public List<string> pickerSource { get; set }

// assign the data to your ItemsSource
pickerSource = pickerList;

// also be sure to set the BindingContext
BindingContext = this;

// this is creating a new picker named pickerSource.  You have already done 
// this in your XAML.  This is NOT NEEDED
var pickerSource = new Picker { Title = "Quantity", TitleColor = Color.Red };
pickerSource.ItemsSource = pickerList;

如果您想在不使用绑定的情况下从代码后面执行此操作,则首先需要指定 x:name 由你控制

<Picker x:Name="myPicker" Grid.Column="4"  Grid.Row="2" />

myPicker.ItemsSource = pickerList;