C# 基础（二十四）将对象object转成时间类型DateTime。或转成一个时间控件DatePicker类型，然后拿出DatePicker.DateTime、DatePicker.Text

最新推荐文章于 2023-04-21 17:32:09 发布

原创最新推荐文章于 2023-04-21 17:32:09 发布 · 5.3k 阅读

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本文介绍了一个使用WPF和XAML进行界面设计与交互处理的示例，展示了如何通过XAML标记和C#代码实现用户界面元素的状态绑定与事件触发。包括日期选择器与按钮操作的详细说明。

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一、简介

开销小（较少的装箱解箱）：

 DateTime? dtEnd = null;
//dtEnd = obj as DateTime;//不能用
//var dtEnd = obj;//可以考虑
dtEnd = (DateTime)obj;//强制转换

但是我我们有时候想要，一次性可以传更多的东西（开销大）：

dtEnd = (DateTime)obj;
DatePicker aa = obj as DatePicker;
string bb = aa.Text;
DateTime dd = (DateTime)aa.SelectedDate;

二、附件

.xmal程序：

<UserControl x:Class="KeenRay.Modules.History.Views.ExInPortDlg"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:cc="clr-namespace:KeenRay.Controls;assembly=KeenRay.Controls"      
             xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
             xmlns:local="clr-namespace:KeenRay.Modules.History.Views"
             xmlns:prism="http://prismlibrary.com/"
             prism:ViewModelLocator.AutoWireViewModel="True"
             mc:Ignorable="d" 
             d:DesignHeight="270" d:DesignWidth="483">
    <Grid Name="rootGrid" Background="#dbdce1">
        <Grid.RowDefinitions>
            <RowDefinition Height="30"/>
            <RowDefinition Height="50"/>
            <RowDefinition Name="hidedRow1" Height="0"/>
            <RowDefinition />
        </Grid.RowDefinitions>
        <Canvas Grid.Row="0">
            <Label Canvas.Left="40" Content="选项:"></Label>
        </Canvas>

        <Canvas Grid.Row="1">
            <RadioButton  Name="radioImport" Content="导入" Canvas.Left="109" Canvas.Top="18" IsChecked="{Binding RadioImportIsChecked,Mode=TwoWay}">
                <i:Interaction.Triggers>
                    <i:EventTrigger EventName="Checked">
                        <i:InvokeCommandAction Command="{Binding radioImportCheckedCommand}" CommandParameter="{Binding ElementName = radioImport}"/>
                    </i:EventTrigger>
                </i:Interaction.Triggers>
            </RadioButton>
            <RadioButton  Name="radioExport" Content="导出" Canvas.Left="300" Canvas.Top="18" IsChecked="{Binding RadioExportIsChecked,Mode=TwoWay}">
                <i:Interaction.Triggers>
                    <i:EventTrigger EventName="Checked">
                        <i:InvokeCommandAction Command="{Binding radioExportCheckedCommand}" CommandParameter="{Binding ElementName = radioExport}"/>
                    </i:EventTrigger>
                </i:Interaction.Triggers>
            </RadioButton>
        </Canvas>

        <Grid Grid.Row="2">
            <Grid.RowDefinitions>
                <RowDefinition Height="30"/>
                <RowDefinition Height="40"/>
                <RowDefinition/>
            </Grid.RowDefinitions>
            <Canvas Grid.Row="0">
                <Label Content="导出选项:" Canvas.Left="40" Canvas.Top="6"/>
            </Canvas>
            <Canvas Grid.Row="1">
                <RadioButton  Name="radioExportCurSelect" Canvas.Left="109" Canvas.Top="15" Content="导出当前选择检查" IsChecked="{Binding radioExportCurSelectIsChecked,Mode=TwoWay}">
                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="Checked">
                            <i:InvokeCommandAction Command="{Binding radioExportCurSelectCheckedCommand}" CommandParameter="{Binding ElementName = radioExportCurSelect}"/>
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                </RadioButton>
                <RadioButton Name="radioExportDateRange" Canvas.Left="300" Canvas.Top="15" Content="导出时间段检查" IsChecked="{Binding radioExportDateRangeIsChecked,Mode=TwoWay}">
                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="Checked">
                            <i:InvokeCommandAction Command="{Binding radioExportDateRangeCheckedCommand}" CommandParameter="{Binding ElementName = radioExportDateRange}"/>
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                </RadioButton>
            </Canvas>
            <Canvas Grid.Row="2">
                <DatePicker Name="dpkDateStart" Style="{StaticResource ExPortDatePickerStyle}" Canvas.Left="109" Width="150">
                    <i:Interaction.Triggers>
                        <!--默认加载-->
                            <i:EventTrigger EventName="Loaded">
                            <i:InvokeCommandAction Command="{Binding dpkDateStartLoadedCommand}" CommandParameter="{Binding ElementName = dpkDateStart}"/>
                        </i:EventTrigger>
                        <!--选中日期-->
                        <i:EventTrigger EventName="SelectedDateChanged">
                            <i:InvokeCommandAction Command="{Binding dpkDateStartSelectedDateChangedCommand}" CommandParameter="{Binding ElementName = dpkDateStart}"/>
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                </DatePicker>

                <DatePicker Name="dpkDateEnd"   Style="{StaticResource ExPortDatePickerStyle}" Canvas.Left="300" Width="150" SelectedDate="" Text="" Tag="">
                    <i:Interaction.Triggers>
                        <!--默认加载-->
                        <i:EventTrigger EventName="Loaded">
                            <i:InvokeCommandAction Command="{Binding dpkDateEndLoadedCommand}" CommandParameter="{Binding ElementName = dpkDateEnd}"/>
                        </i:EventTrigger>
                        
                        <!--选中日期-->
                        <i:EventTrigger EventName="SelectedDateChanged">
                            <i:InvokeCommandAction Command="{Binding dpkDateEndSelectedDateChangedCommand}" CommandParameter="dpkDateEnd"/>
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                </DatePicker>
            </Canvas>
        </Grid>
        <Canvas Grid.Row="3">
            <cc:ImageButton  Content="{DynamicResource History.PrintSetting.Operate.Content}" Width="100" Height="30" Canvas.Right="200" Canvas.Left="246" Canvas.Top="5" FontSize="18" IsDefault="True" Foreground="#606467" DefaultImage="{StaticResource Public.EmptyButton122x52.Enable.Icon}"  PressedImage="{StaticResource Public.EmptyButton112x52.Touches.Icon}" Command="{Binding OperateCommand}"></cc:ImageButton>
            <cc:ImageButton  Content="{DynamicResource History.PrintSetting.Cancel.Content}" Width="100" Height="30" Canvas.Right="5" Canvas.Left="351" Canvas.Top="5" FontSize="18" Foreground="#606467" DefaultImage="{StaticResource Public.EmptyButton122x52.Enable.Icon}"  PressedImage="{StaticResource Public.EmptyButton112x52.Touches.Icon}" Command="{Binding CancelCommand}"></cc:ImageButton>
        </Canvas>
    </Grid>
</UserControl>

.cs程序

     private void DpkDateEnd_SelectedDateChanged(object obj)
        {
            //dtEnd = this.dpkDateEnd.SelectedDate;
            //var dtEnd = obj;
            dtEnd = (DateTime)obj;
            DatePicker aa = obj as DatePicker;
            string bb = aa.Text;
            DateTime dd = (DateTime)aa.SelectedDate;
            等等
        }