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我有以下代碼:如何使用「<%#綁定(」比較一個varchar燒焦
<asp:DropDownList ID="ddlStudyYear" runat="server" SelectedValue='<%# Bind("StudyYearID") %>' DataSourceID="sdsStudyYears" DataTextField="StudyYearID" DataValueField="StudyYearID"></asp:DropDownList>
<asp:SqlDataSource ID="sdsStudyYears" runat="server" ConnectionString="<%$ ConnectionStrings:ATCNTV1ConnectionString %>" SelectCommand="SELECT StudyYearID FROM tblStudyYears ORDER BY StudyYearID"></asp:SqlDataSource>
但它不工作,因爲綁定(「StudyYearID」)來自另一個的SqlDataSource進一步下跌的代碼,它返回一個VARCHAR(3)然而,上述(sdsStudyYears)數據源返回一個值作爲CHAR(3)
所以,當我運行它,我得到以下錯誤:。
'ddlStudyYear' has a SelectedValue which is invalid because it does
not exist in the list of items.
我沒有翅膀在網上也可以,但是在Bind()函數中必須有一個方法來告訴它將CAST varchar char轉換爲char。或者可能是一個圍繞SelectedValue屬性來執行轉換的函數?
任何幫助表示讚賞。
謝謝