C# 复杂的SQL查询数据绑定到DataGrid

在尝试为现有数据库创建应用程序时，我使用了这个复杂的SQL查询，并将其传输到DataGrid

private void buttonlaunch_Click(object sender, EventArgs e)
    {
        dataAkt.DataContext = GetComments("SELECT a1.*, inspectors.cFullName, organizations.cOrgName, d1.cString, d2.cString, d3.cString, towns.cTownName " +
                                            "FROM akt as a1 "+
                                            "left join inspectors on  a1.nDocInspektor = inspectors.ROWID "+
                                            "left join organizations on organizations.nDirectoryType = organizations.ROWID "+
                                            "left join directories as d1 on a1.nOrgFormVlast = d1.ROWID "+
                                            "left join directories as d2 on a1.nOrgVidPidpr = d2.ROWID "+
                                            "left join directories as d3 on a1.nOrgVidEPDial = d3.ROWID "+
                                            "left join towns on a1.nDocMisceSkladannya=towns.ROWID").DefaultView;
    }

在XAML中

<DataGrid x:Name="dataAkt" ItemsSource="{Binding}" AutoGenerateColumns="False"  HorizontalAlignment="Left"  VerticalAlignment="Top" SelectionChanged="dataAkt_SelectionChanged" Margin="10,10,0,0">
   <DataGrid.Columns>
        <DataGridTextColumn Binding="{Binding Path=cName}" Header="Название/комментарий" Width="100"  IsReadOnly="True" Visibility="Collapsed" />
        <DataGridTextColumn Binding="{Binding Path=ROWID}" Header="Номер"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=cDocNomer}" Header="Номер документа"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=dDocDate, StringFormat=\{0:dd.MM.yyyy\}}" Header="Дата составления"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=cOrgName}" Header="Субъект хозяйствования"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=cFullName}" Header="Персонал ГОСТРУД"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=cDocUch1}" Header="При участии"  Width="100"  IsReadOnly="True"/>
        <DataGridTextColumn Binding="{Binding Path=organizations.cOrgName}" Header="Тип организации"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=d1.cString}" Header="Форма собственности"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=d2.cString}" Header="Вид предпринимательства"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=d3.cString}" Header="Вид экономической деятельности"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=towns.cTownName}" Header="Место составления"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=cOrgAdresa}" Header="Адрес организации"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=cOrgPhoneFax}" Header="Телефон/Факс"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=cPosPIB}" Header="Фамилия, имя, отчество"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=cPosPosada}" Header="Должность"  Width="100" IsReadOnly="True"/>
        <DataGridTextColumn Binding="{Binding Path=fPerZaborg}" Header="Задолженность, тыс. руб"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=fPerZaborgZv}" Header="Зад. уволенным, тыс. руб"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=MyBoolValue, Converter={StaticResource BooleanToStringConverter}}" Header="Проверка в ночное время"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=nPerPropoz}" Header="Внесено предложений"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=cOrgIndKod}" Header="Идентификационный номер"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=cOrgFormVlastKod}" Header="Код формы собственности"  Width="100"  IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=cOrgVidEPDialKod}" Header="Код вида экономической деятельности"  Width="100"  IsReadOnly="True" />
    </DataGrid.Columns>

---

MySQL Workbench为我提供了结果表，其中包含我需要的所有列，但在

dataAkt

colunms

organizations.cOrgName

d1.cString

d2.cString

d3.cString

coluns都可以使用。无法解决原因。

您需要为列提供有意义的别名。你有：

organizations.cOrgName AS ocOrgName, d1.cString, d2.cString, d3.cString ...

将此更改为：

organizations.cOrgName AS ocOrgName, d1.cString AS d1cString, d2.cString AS d2cString, d3.cString AS d3cString ...

现在，您可以像这样正确绑定到列：

<DataGridTextColumn Binding="{Binding Path=ocOrgName}" Header="Тип организации"  Width="100"  IsReadOnly="True" />
<DataGridTextColumn Binding="{Binding Path=d1cString}" Header="Форма собственности"  Width="100"  IsReadOnly="True" />
<DataGridTextColumn Binding="{Binding Path=d2cString}" Header="Вид предпринимательства"  Width="100"  IsReadOnly="True" />
<DataGridTextColumn Binding="{Binding Path=d3cString}" Header="Вид экономической деятельности"  Width="100"  IsReadOnly="True" />

---

问题是，选择为

towns.cTownName

的列将不会获得结果集中的名称

towns.cTownName

，它将被命名为

cTownName

，而不带表前缀。由于表、

d1

、

d2

和

d3

都有同名的列（

cString

），您需要为它们提供别名，以便能够区分哪个是哪个。

谢谢，我对这方面还不太熟悉，对SQL中的别名一无所知，这个查询是我所做过的最复杂的查询。工作得很顺利