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Question

$字符我有以下代碼段：

<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
    ConnectionString="<%$ ConnectionStrings:MainConnStr %>" 
    SelectCommand="SELECT [au_id], [au_lname], [au_fname], [state] FROM [authors]" /> 

什麼是ConnectionString中的價值$字符的含義屬性？

Answer 1

它被稱爲ASP.NET中的表達。您可以獲取配置信息，如ConnectionStrings或AppSettings以及Resources。

ASP.NET Expressions Overview

Answer 2

They're expressions, read about them here

Read about all inline tags here