我正在使用一个使用大量内联SQL查询的asp.net网站......我想知道最好是在运行时创建内联查询:
int i = 500;
using (SqlConnection conn = new SqlConnection(connStr))
{
SqlCommand com = new SqlCommand(conn);
...
com.CommandText = "select from table where column < @parameter";
...
}
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或者有一个类来保存应用程序所需的所有查询.像这样的东西:
class SqlQueries
{
private string query1 =
"select * from tblEmployees where EmployeeName = @EmployeeName";
private string query2 =
"select * from tblVacation where EmployeeName = @EmployeeName";
public string Query(string s)
{
string str = string.Empty;
switch (s)
{
case "query1":
str = query1;
break;
case "query2":
str = query2; …Run Code Online (Sandbox Code Playgroud) 如何检查字符串是否包含以下字符"-A"后跟一个数字?
例如:thisIsaString-A21 = yes,包含"-A"后跟一个数字
例如:thisIsaNotherString-AB21 = no,不包含"-A"后跟数字
public interface IMyInterface
{
List<string> MyList(string s)
}
public class MyClass : IMyInterface
{
public List<string> MyList(string s)
}
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有什么区别:
[Method]
MyClass inst = new MyClass();
...
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要么:
[Method]
var inst = new MyClass() as IMyInterface;
...
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要么:
[Method]
IMyInterface inst = new MyClass();
...
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使用IMyInterface的实现的正确方法是什么?
我有一个名为lst的List <string []>:
[0] "ABC" "DEF" "GHI"
[1] "JKL" "MNO" "PQR"
[2] etc, etc...
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如何在每个lst成员的末尾添加另一个字符串?
string s ="EndOfBlock";
[0] "ABC" "DEF" "GHI" "EndOfBlock"
[1] "JKL" "MNO" "PQR" "EndOfBlock"
[2] etc, etc...
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谢谢.
假设你有一个列表<string []>
List<string[]> lst = new List<string[]>();
lst.Add(new string[] { "A", "100.10" });
lst.Add(new string[] { "B", "250.49" });
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如何获得列表中第二个数组项的总和?
将需要将第二个数组项转换为double并将它们相加.预期结果为350.59.
谢谢!