根據(jù)已有報告文件創(chuàng)建Web服務
Jun 21, 2016 am 09:14 AM
web|web服務|創(chuàng)建
Web服務可以被多個不同用戶所訪問，那么報告（reporting）又該是怎樣的呢？Crystal Reports已經成為了Visual Studio中事實上的報告標準，并且通過Visual Studio.NET現(xiàn)在已經可以將報告文件轉換為Web服務。然后可以通過訪問這些Web服務來將報告發(fā)送給企業(yè)內部或外部的用戶。本文中，我們將一起來看看如何根據(jù)已有的報告文件來創(chuàng)建Web服務。在本文第二部分，我們將分析如何使用所創(chuàng)建的Web服務。
注意：在本教程中我們將使用Visual Studio.NET 2003。在開始學習之前，請檢查你已經安裝了Visual Studio以及所有的Crystal Reports組件，包括“Crystal Web services”相關選項。
打開Visual Studio，從Start菜單中選擇File > New > Project來創(chuàng)建新的ASP.NET Web Application。在本例中，我們將此項目命名為“ReportService”。
在創(chuàng)建項目之后，需要創(chuàng)建或添加已有的Crystal Report，我們將在后面將其轉換為Web服務。如果還沒有報告文件，可以使用同Visual Studio一同發(fā)布的示例報告，它位于C:Program FilesMicrosoft Visual Studio .NET 2003Crystal ReportsSamplesReports。在本例中，我們將使用在General Business示例文件夾中的“World Sales Report.rpt”。
要在項目中添加已有的報告，可以選擇Project > Add Existing Item，然后將對話框底部的下拉列表改為“Crystal Reports”，并選擇希望添加的報告文件。
下一步，在Solution Explorer選定報告，然后直接右鍵單擊報告。右鍵單擊菜單中會出現(xiàn)“Publish as Web service”選項。選擇此選項將產生一個ASMX文件，你可以通過右鍵單擊此文件（本例中為“World Sales ReportService.asmx”）并選擇“View in Browser”來對其進行查看。
此預覽將顯示所有對Web服務允許進行的操作，其中包括：
DrillGraph
Refresh
FindText
GetPage
GetTotaller
TestReport
GetGroupLevelData
FindGroup
GetLastPageNumber
GetReportInfo
Export
這里還會有一個鏈接鏈到使用WSDL（Web服務定義語言，Web Service Definition Language）所編寫的正式的Web服務定義。
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