BindingExpression路径错误：'lim'上找不到'username'属性（请帮助）

本文介绍了BindingExpression路径错误：'lim'上找不到'username'属性（请帮助）的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我尝试使用此代码绑定后收到此错误 （任何人都可以帮我解决此错误吗？）

< 网格 x：名称 = ContentGrid 保证金 = 0 ，22,0，-22 Grid.Row = 1 > < ListBox 高度 = 444 Horizo​​ntalAlignment = 左 保证金 = 20,81,0,0 名称 = listBox1 VerticalAlignment = Top 宽度 = 434 > < ListBox.ItemTemplate > < DataTemplate > < StackPanel 方向 = 水平 > < TextBlock 文本 = {Binding username} / > < TextB锁 文字 = {Binding password} / > < TextBlock 文本 = {Binding gender} / > < / StackPanel > < / DataTemplate > < / ListBox.ItemTemplate > < / ListBox > < / Grid >

错误 System.Windows.Data错误：BindingExpression路径错误：''用户名在''lim''''System.String''找不到属性（HashCode = 339799040）。 BindingExpression：Path =''username''DataItem =''lim''（HashCode = 339799040）; target元素是''System.Windows.Controls.TextBlock''（Name =''''）; target属性是''Text''（类型''System.String''）.. 我的整个项目代码 xaml代码

< phone：PhoneApplicationPage x：Class = Epromo.MainPage xmlns = schemas.microsoft/winfx/2006/xaml/presentation xmlns：x = schemas.microsoft/winfx/2006/xaml xmlns：phone = clr-namespace：Microsoft.Phone.Controls; assembly = Microsoft.Phone xmlns：shell = clr-namespace：Microsoft.Phone.Shell; assembly = Microsoft.Phone xmlns：d = schemas.microsoft/expression/ blend / 2008 xmlns：mc = schemas.openxmlformats/markup-compatibility/2006 mc：可忽略 = d d：DesignWidth = 480 d：DesignHeight = 768 FontFamily = {StaticResource PhoneFontFamilyNormal} FontSize = {StaticResource PhoneFontSizeNormal} 前景 = {StaticResource PhoneForegroundBrush} SupportedOrientations = 肖像 方向 = Portrait shell：SystemTray.IsVisible = True > <！ - Layo utRoot是放置所有页面内容的根网格 - > < 网格 x：名称 = LayoutRoot 背景 = 透明 > < Grid.RowDefinitions > < RowDefinition 高度 = 83 / > < RowDefinition 高度 = 685 * / > < / Grid.RowDefinitions > ; <！ - TitlePanel包含应用程序名称和页面标题 - > < StackPanel x：名称 = TitlePanel 保证金 = 9,17,3,0 > < / StackPanel > < 按钮 内容 = 正在进行 Horizo​​ntalAlignment = 左 保证金 = - 5,85,0,0 VerticalAlignment = Top Grid.RowSpan = 2 宽度 = 195 / > < 按钮 内容 = 大多数视图 Horizo​​ntalAlignment = 左 保证金 = 161,85,0,0 VerticalAlignment = Top Grid.RowSpan = 2 宽度 = 186 RenderTransformOrigin = 0.5,0.5 / > < 按钮 内容 = 即将推出 Horizo​​ntalAlignment = 左 保证金 = 321， 85，-13,0 VerticalAlignment = Top Grid.RowSpan = 2 宽度 = 170 FontSize = 20 高度 = 72 / > < 网格 x：名称 = ContentGrid 保证金 = 0,22,0，-22 Grid.Row = 1 > < ListBox 高度 = 444 Horizo​​ntalAlignment = 左 保证金 = 20,81,0,0 名称 = listBox1 VerticalAlignment = Top 宽度 = 434 > < ListBox.ItemTemplate > < DataTemplate > < StackPanel 方向 = 水平 > < TextBlock 文本 = {Binding username} / > < TextBlock 文字 = {绑定密码} / > < TextBlock 文字 = {绑定性别} / > < / StackPanel > < / DataTemplate > < / ListBox.ItemTemplate > < / ListBox > < / Grid > < 按钮 内容 = 注册 FontSize = 17 高度 = 60 名称 = 注册 宽度 = 120 点击 = signup_Click 保证金 = 371,43，-11,647 Grid.RowSpan = 2 / > < TextBlock x：名称 = ApplicationTitle 样式 = {StaticResource PhoneTextNormalStyle} FontSize = 24 FontFamily = Times New Roman 高度 = 34 保证金 = 4,0,32,49 > < 运行 文字 = Epromo / > < / TextBlock > <！ - ContentPanel - 在此处添加其他内容 - > < ; / Grid > < / phone：PhoneApplicationPage >

cs code 使用 Epromo.ServiceReference1; 命名空间 Epromo { public partial class MainPage：PhoneApplicationPage { private Service1Client _serviceClient; // 构造函数 public MainPage（） { InitializeComponent（）; 已加载+ = 新 RoutedEventHandler（Post_Loaded）; } void Post_Loaded（ object sender，EventArgs e） { _serviceClient = new Service1Client（）; _serviceClient.ListPostCompleted + = new EventHandler< ListPostCompletedEventArgs>（getList_Completed）; _serviceClient.ListPostAsync（）; } void getList_Completed（ object sender，ListPostCompletedEventArgs e） { listBox1.ItemsSource = e.Result; } private void signup_Click（ object sender，RoutedEventArgs e） { NavigationService.Navigate（ new Uri（ / signupPage.xaml，UriKind.Relative））; } } }

解决方案

修改绑定 < TextBlock Text =" {Binding username}" /> to < TextBlock Text =" {Binding}" /> 并删除其他两个...检查结果！你得到了什么？ 提示：你正在将DataTable转换为List，其中每个记录的列组成一个完整的新记录。在你的清单中，例如： DataTable看起来像： User1 |密码1 |男性 User2 |密码2 |男性 User3 |密码3 |女性 看起来像： 用户1 密码1 男 用户2 密码2 男 用户3 密码3 女性 ItemsControl现在尝试显示表示为字符串的所有9条记录。对于每个字符串，它应用DataTemplate。绑定到例如username现在尝试在Type String的离子上获取名为username的属性。 另一条线索：修改Binding，使其显示为： < TextBlock Text =" {Binding Length}" /> （绑定到属性字符串中实际应存在的属性长度） 考虑到这一点，请重新检查绑定错误。所有这些信息都在那里！ 我希望我能稍微清理一下

i am getting this error after i try to binding using this code (can anyone help me with this error?)

<Grid x:Name="ContentGrid" Margin="0,22,0,-22" Grid.Row="1"> <ListBox Height="444" HorizontalAlignment="Left" Margin="20,81,0,0" Name="listBox1" VerticalAlignment="Top" Width="434" > <ListBox.ItemTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <TextBlock Text="{Binding username}" /> <TextBlock Text="{Binding password}" /> <TextBlock Text="{Binding gender}" /> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </Grid>

error System.Windows.Data Error: BindingExpression path error: ''username'' property not found on ''lim'' ''System.String'' (HashCode=339799040). BindingExpression: Path=''username'' DataItem=''lim'' (HashCode=339799040); target element is ''System.Windows.Controls.TextBlock'' (Name=''''); target property is ''Text'' (type ''System.String'').. my whole project code xaml code

<phone:PhoneApplicationPage x:Class="Epromo.MainPage" xmlns="schemas.microsoft/winfx/2006/xaml/presentation" xmlns:x="schemas.microsoft/winfx/2006/xaml" xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" xmlns:d="schemas.microsoft/expression/blend/2008" xmlns:mc="schemas.openxmlformats/markup-compatibility/2006" mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768" FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" SupportedOrientations="Portrait" Orientation="Portrait" shell:SystemTray.IsVisible="True" > <!--LayoutRoot is the root grid where all page content is placed--> <Grid x:Name="LayoutRoot" Background="Transparent"> <Grid.RowDefinitions> <RowDefinition Height="83"/> <RowDefinition Height="685*"/> </Grid.RowDefinitions> <!--TitlePanel contains the name of the application and page title--> <StackPanel x:Name="TitlePanel" Margin="9,17,3,0"></StackPanel> <Button Content="On going" HorizontalAlignment="Left" Margin="-5,85,0,0" VerticalAlignment="Top" Grid.RowSpan="2" Width="195"/> <Button Content="most view" HorizontalAlignment="Left" Margin="161,85,0,0" VerticalAlignment="Top" Grid.RowSpan="2" Width="186" RenderTransformOrigin="0.5,0.5"/> <Button Content="Coming soon" HorizontalAlignment="Left" Margin="321,85,-13,0" VerticalAlignment="Top" Grid.RowSpan="2" Width="170" FontSize="20" Height="72"/> <Grid x:Name="ContentGrid" Margin="0,22,0,-22" Grid.Row="1"> <ListBox Height="444" HorizontalAlignment="Left" Margin="20,81,0,0" Name="listBox1" VerticalAlignment="Top" Width="434" > <ListBox.ItemTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <TextBlock Text="{Binding username}" /> <TextBlock Text="{Binding password}" /> <TextBlock Text="{Binding gender}" /> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </Grid> <Button Content="sign up" FontSize="17" Height="60" Name="signup" Width="120" Click="signup_Click" Margin="371,43,-11,647" Grid.RowSpan="2" /> <TextBlock x:Name="ApplicationTitle" Style="{StaticResource PhoneTextNormalStyle}" FontSize="24" FontFamily="Times New Roman" Height="34" Margin="4,0,32,49"> <Run Text="Epromo" /></TextBlock> <!--ContentPanel - place additional content here--> </Grid> </phone:PhoneApplicationPage>

cs code

using Epromo.ServiceReference1; namespace Epromo { public partial class MainPage : PhoneApplicationPage { private Service1Client _serviceClient; // Constructor public MainPage() { InitializeComponent(); Loaded += new RoutedEventHandler(Post_Loaded); } void Post_Loaded(object sender, EventArgs e) { _serviceClient = new Service1Client(); _serviceClient.ListPostCompleted += new EventHandler<ListPostCompletedEventArgs>(getList_Completed); _serviceClient.ListPostAsync(); } void getList_Completed(object sender, ListPostCompletedEventArgs e) { listBox1.ItemsSource = e.Result; } private void signup_Click(object sender, RoutedEventArgs e) { NavigationService.Navigate(new Uri("/signupPage.xaml", UriKind.Relative)); } } }

解决方案

modify the Binding <TextBlock Text="{Binding username}" /> to <TextBlock Text="{Binding}" /> and remove the other two...examine the result! what are you getting? Hint: your are transforming the DataTable to a List, where the columns of each record makes up a complete new "record" in your list, e.g.: The DataTable looks like: User1 | Password1 | male User2 | Password2 | male User3 | Password3 | female THe lsit looks like: User1 Password1 male User2 Password2 male User3 Password3 female The ItemsControl now tries to display all of those 9 records represented as a string. for each string it applies the DataTemplate. The Binding to e.g. "username" now tries to get a property named "username" on an ionstance of Type String. Another clue: Modify the Binding, so that it reads: <TextBlock Text="{Binding Length}" /> (Binding to a Property "Length" that should actually exist on type String) With this in mind, reexamine the Binding-Error. All this Information is in there! I hope i could clear up things a little bit