• Silverlight 4 DataGrid动态生成列及绑定数据


    原文地址:http://hi.baidu.com/wutaof509/blog/item/d5306512500ad01db8127b47.html

    补充:  AutoGenerateColumns - 是否根据数据源自动生成列
        RowDetailsVisibilityMode - 显示相应的行的详细数据时所使用的显示模式
        DataGrid.Columns - 手工定义DataGrid的列
        DataGrid.RowDetailsTemplate - 用于显示相应的行的详细数据的模板
        AreRowDetailsFrozen - 是否冻结 RowDetailsTemplate
        GridLinesVisibility - 表格分隔线的显示方式
        RowBackground - 奇数数据行背景
        AlternatingRowBackground - 偶数数据行背景
        IsReadOnly - 单元格是否只读
        FrozenColumnCount - 表格所冻结的列的总数(从左边开始数)
        SelectionMode - 行的选中模式
        CanUserReorderColumns - 是否允许拖动列
        CanUserResizeColumns - 是否允许改变列的宽度
        CanUserSortColumns - 是否允许列的排序
        VerticalGridLinesBrush - 改变表格的垂直分隔线的 Brush
        HorizontalGridLinesBrush - 改变表格的水平分隔线的 Brush
        HeadersVisibility - 表头(包括列头和行头)的显示方式

    This process is pretty straight forward, so instead of doing the usual end-to-end walk through, I'm going to provide you with a Rosetta Stone between the static XAML form and the dynamic C#/VB form for the scenario in the last post.
    Defining a DataGrid

    For any of these columns to be useful you are going to first need a DataGrid to add them to.  The following creates a DataGrid, adds it as a child of the root layout Grid, and sets its ItemsSource to a collection called "source".

    C#

    DataGrid targetDataGrid = new DataGrid();
    targetDataGrid.ItemsSource = source;
    LayoutRoot.Children.Add(targetDataGrid);

    C#

    using System.Windows.Data;

    ...

    DataGridTextBoxColumn textBoxColumn = new DataGridTextBoxColumn();
    textBoxColumn.Header = "First Name";
    textBoxColumn.DisplayMemberBinding = new Binding("FirstName");
    targetDataGrid.Columns.Add(textBoxColumn);


    C#

    using System.Windows.Data;

    ...

    DataGridCheckBoxColumn checkBoxColumn = new DataGridCheckBoxColumn();
    checkBoxColumn.Header = "Available";
    checkBoxColumn.DisplayMemberBinding = new Binding("Available");
    targetDataGrid.Columns.Add(checkBoxColumn);



    Defining a DataGrid Template Column

    The following creates a DataGridTemplateColumn bound to the Birthday property with a header of "Birthday", and adds it to the columns collection of the DataGrid named "targetDataGrid".
    Static

    <UserControl.Resources>
    <local:DateTimeConverter x:Key="DateConverter" />
    </UserControl.Resources>

    ...

    <my:DataGrid x:Name="targetDataGrid" AutoGenerateColumns="False" >
    <my:DataGrid.Columns>
    <my:DataGridTemplateColumn Header="Birthday">
    <my:DataGridTemplateColumn.CellTemplate>
    <DataTemplate>
    <TextBlock
    Text="{Binding Birthday,
    Converter={StaticResource DateConverter}}"
    FontFamily="Trebuchet MS" FontSize="11"
    Margin="5,4,5,4"/>
    </DataTemplate>
    </my:DataGridTemplateColumn.CellTemplate>
    <my:DataGridTemplateColumn.CellEditingTemplate>
    <DataTemplate>
    <DatePicker
    SelectedDate="{Binding Birthday, Mode=TwoWay}" />
    </DataTemplate>
    </my:DataGridTemplateColumn.CellEditingTemplate>
    </my:DataGridTemplateColumn>
    </my:DataGrid.Columns>
    </my:DataGrid>

    Dynamic

    There are two ways to dynamically create a template column for a DataGrid.  One is to load in the CellTemplate and CellEditingTemplates as DataTemplates from resources, and the other is to construct the DataTemplates on the fly using XamlReader.

    1. Resources Method

    This method creates the CellTemplate DataTemplate and the CellEditingTemplate DataTemplate in XAML and stores them as named resources.  Then when the column is created the DataTemplates are used.

    Use the below XAML to create the DataTemplates as resources to support the code for this method.

    <UserControl.Resources>
    <local:DateTimeConverter x:Key="DateConverter" />
    <DataTemplate x:Key="myCellTemplate">
    <TextBlock
    Text="{Binding Birthday,
    Converter={StaticResource DateConverter}}"
    FontFamily="Trebuchet MS" FontSize="11"
    Margin="5,4,5,4"/>
    </DataTemplate>
    <DataTemplate x:Key="myCellEditingTemplate">
    <DatePicker
    SelectedDate="{Binding Birthday, Mode=TwoWay}" />
    </DataTemplate>
    </UserControl.Resources>

    C#

    using System.Windows.Data;

    ...

    DataGridTemplateColumn templateColumn = new DataGridTemplateColumn();
    templateColumn.Header = "Birthday";
    templateColumn.CellTemplate = (DataTemplate)Resources["myCellTemplate"];
    templateColumn.CellEditingTemplate =
    (DataTemplate)Resources["myCellEditingTemplate"];
    targetDataGrid.Columns.Add(templateColumn);

    2. XamlReader Method

    This method creates the DataTemplate inline using the XamlReader class.  This class takes a string and parses it to try to build a visual tree.  In this case we are creating DataTemplates.  This method is especially useful if the DataTemplate itself has to be dynamic.  One example being if you wanted to modify what the element in the template was data bound to.

    Warning: This method is considerably more difficult than the resources method.  I recommend only using this if you need to dynamically create the DataTemplate.

    Some things to watch out for:

    1. You will need to declare any XAML namespace that is used in the data template
    2. Any custom XAML namespace needs to specify both the clr-namespace and the assembly
    3. You cannot have white space between the xmlns: and the name of your namespace
    4. External resources cannot be referenced, they need to be declared inline
    5. The entire template is a single line, so if you get a XAML Parse exception, it will always say line 1, however the character is fairly accurate if you were to concatenate all of your lines.
    6. When using the StringBuilder approach shown below, make sure that you have the correct white space at the end of a line so that it is correctly separated when concatenated with the next line.

    Now that the warnings are out of the way, here is how you do the equivalent of the code above:

    C#

    using System.Windows.Data;
    using System.Windows.Markup;
    using System.Text;

    ...

    DataGridTemplateColumn templateColumn = new DataGridTemplateColumn();
    templateColumn.Header = "Birthday";
    StringBuilder CellTemp = new StringBuilder();
    CellTemp.Append("<DataTemplate ");
    CellTemp.Append("xmlns='http://schemas.microsoft.com/client/2007' ");
    CellTemp.Append("xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml' ");
    //Be sure to replace "YourNamespace" and "YourAssembly" with your app's
    //actual namespace and assembly here
    CellTemp.Append("xmlns:local = 'clr-namespace:YourNamespace");
    CellTemp.Append(";assembly=YourAssembly'>");
    CellTemp.Append("<Grid>");
    CellTemp.Append("<Grid.Resources>");
    CellTemp.Append("<local:DateTimeConverter x:Key='DateConverter' />");
    CellTemp.Append("</Grid.Resources>");
    CellTemp.Append("<TextBlock ");
    CellTemp.Append("Text = '{Binding Birthday, ");
    CellTemp.Append("Converter={StaticResource DateConverter}}' ");
    CellTemp.Append("FontFamily='Trebuchet MS' FontSize='11' ");
    CellTemp.Append("Margin='5,4,5,4'/>");
    CellTemp.Append("</Grid>");
    CellTemp.Append("</DataTemplate>");
    StringBuilder CellETemp = new StringBuilder();
    CellETemp.Append("<DataTemplate ");
    CellETemp.Append("xmlns='http://schemas.microsoft.com/client/2007' ");
    CellETemp.Append("xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'>");
    CellETemp.Append("<DatePicker ");
    CellETemp.Append("SelectedDate='{Binding Birthday, Mode=TwoWay}' />");
    CellETemp.Append("</DataTemplate>");
    templateColumn.CellTemplate =
    (DataTemplate)XamlReader.Load(CellTemp.ToString());
    templateColumn.CellEditingTemplate =
    (DataTemplate)XamlReader.Load(CellETemp.ToString());
    targetDataGrid.Columns.Add(templateColumn);

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  • 原文地址:https://www.cnblogs.com/hl3292/p/2116923.html
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