访问DataGridTemplateColumn内容

Question

我有一个WPF DataGrid模板列，它有一个来自wpf工具包的AutoCompleteBox的DataTemplate。在RowEditEnding事件和验证过程中，我无法看到模板列中的内容。

<DataGridTemplateColumn Header="Account Type" >
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <toolkit:AutoCompleteBox Text="{Binding Path='Account Type'}" Populating="PopulateAccountTypesACB" IsTextCompletionEnabled="True" BorderThickness="0" />
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>



public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)
    {
        if ((value as BindingGroup).Items.Count == 0)
            return new ValidationResult(true, null);

        DataRowView row = (value as BindingGroup).Items[0] as DataRowView;

        if (row != null)
        {
            if (ValidateAccountName(row.Row.ItemArray[0].ToString()))
            {
                return new ValidationResult(true, null);
            }
            else
            {
                return new ValidationResult(false,
                    "Account Name must be between 1 and 100 Characters.");
            }
        }
        else
            return new ValidationResult(true, null);
    }

在创建DataRowView之后，当我在验证函数中放置断点时，模板列是空的。我如何获取它的内容？

Answer 1

经过研究，它似乎与DataGridTemplateColumn没有任何关系，而是与Wpf Toolkit中的AutoCompleteBox有关。自从我开始使用AutoCompleteBox以来，它对我来说就只是个麻烦。因此，我决定放弃它，转而使用一个可编辑的ComboBox。combobox更简洁，实现起来也更简单。下面是我的代码现在的样子，并且datarowview能够看到用户在框中键入的内容：

<DataGridTemplateColumn Header="Account Type">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Path='Account Type'}" />
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
    <DataGridTemplateColumn.CellEditingTemplate>
        <DataTemplate>
            <ComboBox IsEditable="True" LostFocus="LostFocusAccountTypes" ItemsSource="{DynamicResource types}" Height="23" IsTextSearchEnabled="True"/>
        </DataTemplate>
    </DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>

代码隐藏(this.Types是一个可观察的字符串集合)

    private void PopulateAccountTypes()
    {
        try
        {
            string accountQuery = "SELECT AccountType FROM AccountType WHERE UserID = " + MyAccountant.DbProperties.currentUserID + "";

            SqlDataReader accountType = null;
            SqlCommand query = new SqlCommand(accountQuery, MyAccountant.DbProperties.dbConnection);

            accountType = query.ExecuteReader();

            while (accountType.Read())
            {
                this.Types.Add(accountType["AccountType"].ToString());
            }

            accountType.Close();
            Resources["types"] = this.Types;
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

Answer 2

首先，在AutoCompleteBox.Text属性的绑定路径中有一个空格，我认为这是不允许的。