求和DataGrid列

Question

我在DataGrid中有一个Amounts列，我需要在TextBox中求和并显示。我已尝试循环遍历DataGrid行，但无法找到正确的语法。 DataGrid绑定到基于IEnumerable的{​​{1}}。这是代码;

TransactionModel

TransactionModel

XAML绑定到DataGrid

public class TransactionModel
{
    public int TransactionID { get; set; }
    public string TransactionText { get; set; }
    public int TransactionAmount { get; set; }
    public DateTime TransactionDate { get; set; }
    public string TransactionMonth { get; set; }
}  

填充TransactionModel

    <DataGrid x:Name="dataGrid" Margin="5" AutoGenerateColumns="False" HeadersVisibility="Column" SelectionMode="Single" CanUserAddRows="False" CanUserDeleteRows="False" FontSize="20">
        <DataGrid.Columns>
            <DataGridTextColumn Header="Transaction" Width="*" Binding="{Binding TransactionText}"/>
            <DataGridTextColumn Header="Transaction Amount" Width="*" Binding="{Binding TransactionAmount}"/>
            <DataGridTextColumn Header="Transaction Date" Width="*" Binding="{Binding TransactionDate}"/>
            <DataGridTextColumn Header="Transaction Month" Width="*" Binding="{Binding TransactionMonth}"/>
        </DataGrid.Columns>
    </DataGrid>

如何循环显示public IEnumerable<TransactionModel> GetTransactionList() { string constr = ConfigurationManager.ConnectionStrings["sqlString"].ConnectionString; using (var sqlCon = new MySqlConnection(constr)) { sqlCon.Open(); using (var myQuery = sqlCon.CreateCommand()) { myQuery.CommandText = "SELECT id, text, amount, date, month FROM financesystem.transactions ORDER BY id"; using (var myReader = myQuery.ExecuteReader()) { var transactionList = new List<TransactionModel>(); while (myReader.Read()) { var details = new TransactionModel { TransactionID = Convert.ToInt32(myReader[0]), TransactionText = myReader[1].ToString(), TransactionAmount = Convert.ToInt32(myReader[2]), TransactionDate = Convert.ToDateTime(myReader[3], System.Globalization.CultureInfo.CurrentCulture), TransactionMonth = myReader[4].ToString(), }; transactionList.Add(details); } return transactionList; } } } } 中显示的值并将它们相加以显示在DataGrid？

Answer 1

你可以使用IEnumerable的回报来计算总和吗？如果是这样，LINQ很容易：

int amountSum = GetTransactionList().Sum(model => model.TransactionAmount)