获取要在网格中显示的foreach项目c＃asp.net

Question

I am using Weather WebService and I have a gridview with the id forecast . How could I display foreach items in the gridview? I have tried using

forecast += item.Date.ToShortDateString() + "   " + item.Desciption + "|";

But I get the error

'System.Web.UI.WebControls.GridView' does not contain a definition for 'forecast' and no extension method 'forecast' accepting a first argument of type 'System.Web.UI.WebControls.GridView' could be found (are you missing a using directive or an assembly reference? )

WeatherService.WeatherSoapClient weather = new WeatherService.WeatherSoapClient("WeatherSoap");
WeatherService.ForecastReturn for = weather.GetCityForecastByZIP(Zip.Text);

        if (for.Success)
        {
            response.Text = for.ResponseText;
            city.Text = for.City;
            State.Text = for.State;
            WeatherStationCity.Text = for.WeatherStationCity;

            foreach (var item in for.ForecastResult)
            {
                  forecast += item.Date.ToShortDateString() + "   " + item.Desciption + "|";
            }

Answer 1

If you have set the AutoGenerateColumns property to true or not set at all(by default it is true) then no need to loop through your data and bind the gridview. If you want to show the Date & Description as separate columns then you can use a markup like this:-

<asp:GridView ID="forecast" runat="server" AutoGenerateColumns="false">
            <Columns>
                <asp:BoundField HeaderText="Date" DataField="Date" />
                <asp:BoundField HeaderText="Desciption " DataField="Desciption " />
            </Columns>
        </asp:GridView>

This will display your data without formatting, but if you want some formatting to be done then either do it before assigning the datasource (by storing it in a DataTable or Custom List) or in the RowDataBound event of gridview.

Answer 2

Use the following code. ForecastItem class should be defined in a separate file. And add two columns to your gridview, setting DataField property of them to Date and Description (or set AutoGenerateColumns to true)

public class ForecastItem
{
  public string Date {get;set;}
  public string Description {get;set;}
}

.
.
.

WeatherService.WeatherSoapClient weather = new WeatherService.WeatherSoapClient("WeatherSoap");
WeatherService.ForecastReturn for = weather.GetCityForecastByZIP(Zip.Text);

if (for.Success)
{
    response.Text = for.ResponseText;
    city.Text = for.City;
    State.Text = for.State;
    WeatherStationCity.Text = for.WeatherStationCity;
    List<ForecastItem> forecastItems = new List<ForecastItem>();
    foreach (var item in for.ForecastResult)
    {
         forecastItems.Add(new ForcastItem() {
             Date = item.Date.ToShortDateString(),
             Description = item.Desciption
         });
    }
    forecast.DataSource = forecastItems;
    forecast.DataBind();
}