ASP.NET Webforms-使用AJAX调用C#方法 [英] ASP.NET Webforms - Calling a C# method with AJAX

问题描述

我在aspx上有一个asp按钮:

I've an asp button on an aspx :

<asp:Button id="btnReport2" name="btnReport2"  runat="server"  class="gradientBlueBtn" Text="Show Report" OnClientClick="Alert();" ToolTip="Report"/>

如您所见，我正在调用一个使用AJAX调用C#方法的javascript函数.我正在这样做:

As you can see, I'm calling a javascript function which uses AJAX to call a C# method. I'm doing this way :

<script>
    function Alert()
            {
                $.ajax({
                    type: "POST",
                    url: "Selection.aspx/GetReport",
                    contentType: 'application/json; charset=utf-8',
                    dataType: 'json',
                    success: function()
                    {
                        alert('success');
                    },
                    error: function()
                    {
                        alert('error');
                    }
                });

            }
</script>

问题是，单击按钮时，总是收到错误消息.我在做错什么吗?

The thing is, I'm always getting the error message when I'm clicking on the button. Is there something I'm doing wrong?

C#方法.我已经设置了一个断点，以查看是否调用了该方法，但显然没有.

EDIT : The C# method. I've put a breakpoint to see if the method is called but apparently it isn't.

public void GetReport()
{
    AddFilters();
    decimal localCurrencyRate;            
    App_Data.BulkImportDSTableAdapters.ClientsTableAdapter tadptClients = new  App_Data.BulkImportDSTableAdapters.ClientsTableAdapter();
    string legalEntityID = string.Empty;           
    if (txtSrcSys.Text != null)
    {
        DataTable dtSSYS = tadptClients.GetLegalEntityID(txtSrcSys.Text);
        if (dtSSYS.Rows.Count > 0)
        {
            legalEntityID = Convert.ToString(dtSSYS.Rows[0][0]);
        }
    }
    DateTime dtInvoiceFrom = DateTime.ParseExact(txtInvoiceFrom.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture);
    DateTime dtInvoiceTo = DateTime.ParseExact(txtInvoiceTo.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture);
    string strInvoiceFrom = String.Format("{0:yyyyMMdd}", dtInvoiceFrom);
    string strInvoiceTo = String.Format("{0:yyyyMMdd}", dtInvoiceTo);
    string localCurrency = dbcon.getLocalCurrency(legalEntityID);
    DataSet localCurrencyDs = dbcon.getCurrencyRate(localCurrency, strInvoiceFrom);
    if (Convert.ToDecimal(localCurrencyDs.Tables[0].Rows[0]["rate"]) == 0)
        localCurrencyRate = Convert.ToDecimal(localCurrencyDs.Tables[0].Rows[1]["rate"]);
    else
        localCurrencyRate = Convert.ToDecimal(localCurrencyDs.Tables[0].Rows[0]["rate"]);
    string fileQuery = string.Empty;
    if (cbxExpYes.Checked == true && cbxExpNo.Checked == false)
    {                
        fileQuery = File.ReadAllText(Server.MapPath("~/temp/Query.txt")).Replace("{1}", "XFORM_AREA.IMPORT_GE_MAIN_V15BIS m");
        fileQuery = fileQuery.Replace(":param1", localCurrencyRate.ToString());
        fileQuery = fileQuery.Replace("{0}", qb.getFilters().Replace("P.", "m."));
    }
    if (cbxExpYes.Checked == false && cbxExpNo.Checked == true)
    {               
        fileQuery = File.ReadAllText(Server.MapPath("~/temp/Query.txt")).Replace("{1}", "PREIMPORT_GE_MAIN m");
        fileQuery = fileQuery.Replace(":param1", localCurrencyRate.ToString());
        fileQuery = fileQuery.Replace("{0}", qb.getFilters().Replace("P.", "m."));
    }
    if (cbxExpYes.Checked == true && cbxExpNo.Checked == true)
    {               
        fileQuery = File.ReadAllText(Server.MapPath("~/temp/QueryUnion.txt"));
        fileQuery = fileQuery.Replace("{ParamValues}", "pg.DEFVAL ");
        fileQuery = fileQuery.Replace("{ParamTab}", "ref_var_def pg");
        fileQuery = fileQuery.Replace("{ParamCond}", "pg.NM = 'WL_REPORTING_CUR'");
        fileQuery = fileQuery.Replace("{0}", qb.getFilters().Replace("P.", "m."));
        fileQuery = fileQuery.Replace("{1}", qb.getFilters().Replace("P.", "i."));
    }
    ASPxPivotGrid1.OptionsFilter.ShowOnlyAvailableItems = true;
    int indexTravFullName = 0;
    int indexEndTravFullName = 0;
    string paramToRemove = string.Empty;

    indexTravFullName = fileQuery.IndexOf("AND PR.ST_TRAVELLER_FULL_NAME LIKE");
    if (indexTravFullName > 0)
    {
        indexEndTravFullName = fileQuery.Substring(indexTravFullName).IndexOf("AND", 3);
        paramToRemove = fileQuery.Substring(indexTravFullName, indexEndTravFullName);
        fileQuery = fileQuery.Replace(paramToRemove, string.Empty);
    }

    if (!string.IsNullOrEmpty(fileQuery))
    {


        DataSet dsTravels = new DataSet();

        oCmd.CommandText = fileQuery;
        oCmd.CommandType = CommandType.Text;
        oCmd.Connection = oConn;
        odpter.SelectCommand = oCmd;


        odpter.SelectCommand.Parameters.Add(":pSourceSystem", txtSrcSys.Text);
        odpter.SelectCommand.Parameters.Add(":pInvoiceFrom", strInvoiceFrom);
        odpter.SelectCommand.Parameters.Add(":pInvoiceTo", strInvoiceTo);

        if (!String.IsNullOrWhiteSpace(txtCustomNr.Text))
        {
            odpter.SelectCommand.Parameters.Add(":pCustomerNr", txtCustomNr.Text);
        }
        if (!String.IsNullOrWhiteSpace(txtIATA.Text))
        {
            odpter.SelectCommand.Parameters.Add(":Iata", txtIATA.Text);
        }
        if (!String.IsNullOrWhiteSpace(txtCurrCode.Text))
        {
            odpter.SelectCommand.Parameters.Add(":CurrCode", txtCurrCode.Text);
        }
        if (!String.IsNullOrWhiteSpace(txtInvoiceNrFrom.Text))
        {
            odpter.SelectCommand.Parameters.Add(":pInvoiceNrFrom", txtInvoiceNrFrom.Text);
        }
        if (!String.IsNullOrWhiteSpace(txtInvoiceNrTo.Text))
        {
            odpter.SelectCommand.Parameters.Add(":pInvoiceNrTo", txtInvoiceNrTo.Text);
        }
        if (!String.IsNullOrWhiteSpace(txtDossierNrFrom.Text))
        {
            odpter.SelectCommand.Parameters.Add(":pDossierNrFrom", txtInvoiceNrFrom.Text);
        }
        if (!String.IsNullOrWhiteSpace(txtDossierNrFrom.Text))
        {
            odpter.SelectCommand.Parameters.Add(":pDossierNrTo", txtInvoiceNrFrom.Text);
        }
        if (!String.IsNullOrWhiteSpace(txtTravellerName.Text))
        {
            odpter.SelectCommand.Parameters.Add(":pTravellerName", txtTravellerName.Text);
        }
        if (chbxSale.Checked)
        {
            odpter.SelectCommand.Parameters.Add(":pSale", "SA");
        }
        if (chbxRefund.Checked)
        {
            odpter.SelectCommand.Parameters.Add(":pRefund", "RE");
        }
        if (hfTravelWith.Value.Contains("chbxairs"))
        {
            odpter.SelectCommand.Parameters.Add(":pProductAir", "7");
        }
        if (hfTravelWith.Value.Contains("chbxhotels"))
        {
            odpter.SelectCommand.Parameters.Add(":pProductHotel", "3");
        }
        if (hfTravelWith.Value.Contains("chbxcars"))
        {
            odpter.SelectCommand.Parameters.Add(":pProductCar", "1");
        }
        if (hfTravelWith.Value.Contains("chbxrails"))
        {
            odpter.SelectCommand.Parameters.Add(":pProductRail", "6");
        }
        if (hfTravelWith.Value.Contains("chbxmisc"))
        {
            odpter.SelectCommand.Parameters.Add(":pProductMisc", "9");
        }

        if (!String.IsNullOrWhiteSpace(txtBatchNr.Text))
        {
            odpter.SelectCommand.Parameters.Add(":pBatchNr", txtBatchNr.Text);
        }


        odpter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
        odpter.Fill(dsTravels, "ReportTab");
        int count = dsTravels.Tables[0].Rows.Count;
        DataTable dt = dsTravels.Tables[0];


        if (dt.Rows.Count > 0)
        {

            ASPxPivotGrid1.DataSource = dt;
            ASPxPivotGrid1.DataBind();
            Session["dtReport"] = dt;
            //ASPxPivotGrid1.Prefilter.CriteriaString = "[" + ""  + "]";
        }
    }
}

推荐答案

您的方法必须声明为static，并用[WebMethod]装饰.因此，您的方法应为:

Your method must be declared as static and decorated with [WebMethod]. So, your method should be:

[WebMethod]
public static void GetReport()
{
    // Your code here
}

有关更多信息，请查看

For more information, please take a look at this post.

编辑！

我看到您在代码中使用了一些控件(例如txtInvoiceFrom，txtInvoiceTo).将方法设为static后，将无法再访问这些控件.要解决此问题，请按照以下步骤操作(以txtInvoiceTo为例):

I see you use some controls in your code (like txtInvoiceFrom, txtInvoiceTo). After making your method static, you cannot access those controls anymore. To solve this problem, please follow these steps (take txtInvoiceTo as an example):

1. 不要使用txtInvoiceTo.Text或类似方法获取数据.将其作为参数传递.
2. 使用jQuery或其他方法(由您选择)从客户端获取txtInvoiceTo数据，并将其传递给Ajax以发布到服务器.
3. 要通过jQuery获取txtInvoiceTo数据，您可以执行以下操作:$('#<%= txtInvoiceTo.ClientID %>').val()

1. Don't get data by using txtInvoiceTo.Text or something similar. Pass it as a parameter.
2. Get txtInvoiceTo data from client-side, using jQuery or something else (your choice), and pass it to the Ajax to post to server.
3. To get txtInvoiceTo data by jQuery, you can do: $('#<%= txtInvoiceTo.ClientID %>').val()

这篇关于ASP.NET Webforms-使用AJAX调用C#方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！