我编写了一个代码,用于将RDLC ReportViewer与DataSet中的DataTable相连接
但是会发生以下错误:“尚未为数据源'DataSet'提供数据源实例。”
报表查看器的aspx文件代码
这是报告查看器代码
<rsweb:ReportViewer ID="ReportViewer1" runat="server" Font-Names="Verdana"
Font-Size="8pt" InteractiveDeviceInfos="(Collection)"
WaitMessageFont-Names="Verdana" WaitMessageFont-Size="14pt">
<ServerReport ReportPath="Analysis.rdlc" />
<LocalReport ReportPath="Hospital\Analysis.rdlc">
</LocalReport>
</rsweb:ReportViewer>
C#文件代码
这是填充DataSet中DataTable行的代码
ArrayList columns = new ArrayList();
columns.Add("Temp");
columns.Add("Humidity");
columns.Add("Rain");
columns.Add("Mosquitos");
columns.Add("FloodArea");
columns.Add("CloudyWeather");
columns.Add("FlowerVases");
columns.Add("IndequateSanitation");
ArrayList data = new ArrayList();
data.Add(Temp.SelectedItem.ToString());
data.Add(Humidity.SelectedItem.ToString());
data.Add(Rain.SelectedItem.ToString());
data.Add(Mosquitos.SelectedItem.ToString());
data.Add(FloodArea1.SelectedItem.ToString());
data.Add(CloudyWeather.SelectedItem.ToString());
data.Add(FlowerVases.SelectedItem.ToString());
data.Add(IndequateSanitation.SelectedItem.ToString());
BayesAnalysis bAnlysis = new BayesAnalysis();
ArrayList result = bAnlysis.classifyD(DiseaseList.SelectedItem.ToString(), columns, data);
List<double> pn = bAnlysis.PosNum();
NormalAnalysis nAnalysis = new NormalAnalysis();
AnalysisDataSet dss = new AnalysisDataSet();
for (int loop = 0; loop < pn.Count; loop++)
{
dss.ReportData.AddReportDataRow(loop, result[loop].ToString(), nAnalysis.NoPatient(nAnalysis.GetDiseaseID("Dengue"), nAnalysis.GetCityID(result[loop].ToString())), nAnalysis.TotalPatient(nAnalysis.GetDiseaseID("Dengue")), nAnalysis.diseasePercentageInCity(nAnalysis.GetDiseaseID("Dengue"), nAnalysis.GetCityID(result[loop].ToString())), pn[loop]);
}
这是将数据源提供给报表查看器的代码
DataTable dtt = dss.ReportData;
ReportViewer1.Visible = true;
ReportDataSource datasource = new ReportDataSource("Analysis",dtt);
ReportViewer1.LocalReport.DataSources.Clear();
ReportViewer1.LocalReport.DataSources.Add(datasource);
ReportViewer1.LocalReport.Refresh();
答案 0 :(得分:1)
在我的头脑中,我认为你的代码行说:
ReportDataSource datasource = new ReportDataSource("Analysis",dtt);
ReportDataSource datasource = new ReportDataSource("DataSet",dtt);
基本上它与您在RDLC文件中使用的名称有关,当您提供报告数据集时,它必须命名为相同的。