c# - C#.Net 中的连接字符串

Question

// SQL部分

第 1 行：string dd = "Data Source=.\SQLEXPRESS;AttachDbFilename="C:\Users\HEX\Documents\Visual Studio 2008\Projects\cventry_address_book_0.1\cventry_address_book_0.1\addressbook.mdf";Integrated Security=True;Connect Timeout=30;User Instance=True";

第 2 行：SqlConnection sqlconobj = new SqlConnection(dd);

第 3 行：sqlconobj.Open();

---------错误输出------------

意外字符'\'

score 3 · Accepted Answer

在 C# 中，反斜杠字符具有特殊含义。
您需要将其加倍或在整个字符串前面加上逐字字符 @
并且无需在文件名前后加上双引号。
格式化规则（结束分号）允许 AttachDbFileName 的路径或文件名中有空格

 string dd = @"Data Source=.\SQLEXPRESS;AttachDbFilename=" + 
             @"C:\Users\HEX\Documents\Visual Studio 2008\" + 
             @"Projects\cventry_address_book_0.1\cventry_address_book_0.1" + 
             @"\addressbook.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";

score 2 · Accepted Answer

尝试：

string dd = @"Data Source=.\SQLEXPRESS;AttachDbFilename=""C:\Users\HEX\Documents\Visual Studio008\Projects\cventry_address_book_0.1\cventry_address_book_0.1\addressbook.mdf"";Integrated Security=True;Connect Timeout=30;User Instance=True";

您需要使用@字符转义字符串。或者，您可以将 single 替换\为\\.

score 1 · Accepted Answer

您应该通过在字符串前面加上字符来转义字符串@。此外，您应该将 SqlConnection 实例包装在 using 语句中：

string dd = @"Data Source=.\SQLEXPRESS;AttachDbFilename=""C:\Users\HEX\Documents\Visual Studio 2008\Projects\cventry_address_book_0.1\cventry_address_book_0.1\addressbook.mdf"";Integrated Security=True;Connect Timeout=30;User Instance=True";
using (SqlConnection sqlconobj = new SqlConnection(dd))
{
    sqlconobj.Open();
}

score 0 · Accepted Answer

你需要转义这个\角色。用这个：

string dd = @"Data Source=.\SQLEXPRESS;AttachDbFilename="C:\Users\HEX\Documents\Visual Studio 2008\Projects\cventry_address_book_0.1\cventry_address_book_0.1\addressbook.mdf";Integrated Security=True;Connect Timeout=30;User Instance=True";

更多：字符串文字

score 0 · Accepted Answer

string dd = "Data Source=.\\SQLEXPRESS;AttachDbFilename=\"C:\\Users\\HEX\\Documents\\Visual Studio 2008\\Projects\\cventry_address_book_0.1\\cventry_address_book_0.1\\addressbook.mdf\";Integrated Security=True;Connect Timeout=30;User Instance=True";

score 0 · Accepted Answer

这应该是您的查询连接字符串

string dd = @"Data Source=.\SQLEXPRESS;AttachDbFilename=" + 
                            @"C:\Users\HEX\Documents\Visual Studio 2008\Projects\cventry_address_book_0.1\cventry_address_book_0.1\addressbook.mdf" 
                            + ";Integrated Security=True;Connect Timeout=30;User Instance=True";

c# - C#.Net 中的连接字符串

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