C#编码规范

1、连接数据库并返回DataTable

 

View Code

   
   

    
    public
    
     DataTable GetDataByTable()
 {
 DataSet dataset 
    
    =
    
     
    
    new
    
     DataSet();
 DataTable datatable 
    
    =
    
     
    
    null
    
    ;
 SqlConnection sqlConnection 
    
    =
    
     
    
    new
    
     SqlConnection(
    
    "
    
    Data Source=.;Initial Catalog=Calamity_Data;Integrated Security=True
    
    "
    
    );
 
    
    try
    
    
 {
 SqlDataAdapter sqlDataAdapter 
    
    =
    
     
    
    new
    
     SqlDataAdapter(
    
    "
    
    select top 50 * from calamity
    
    "
    
    , sqlConnection);
 sqlDataAdapter.Fill(dataset, 
    
    "
    
    calamity
    
    "
    
    );
 
    
    if
    
     (dataset 
    
    !=
    
     
    
    null
    
     
    
    &&
    
     dataset.Tables.Count 
    
    >
    
     
    
    0
    
    )
 {
 datatable 
    
    =
    
     dataset.Tables[
    
    0
    
    ];
 }
 }
 
    
    catch
    
     (Exception e)
 {
 }
 
    
    finally
    
    
 {
 sqlConnection.Close();
 }
 Console.WriteLine(
    
    "
    
    Calling WCF Service,Transfer data using DataTable
    
    "
    
    );
 
    
    return
    
     datatable;
 }
   
   

2、连接数据库文件的相对路径

  
  

   
   SqlConnection sqlConnection 
   
   =
   
    
   
   new
   
    SqlConnection(
   
   "
   
   Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Database\\DatabaseWCF.mdf;Integrated Security=True;User Instance=True
   
   "
   
   );
  
  

3、数组

交叉数组

for实现 

   
   

    
    int
    
    [][] arri 
    
    =
    
     
    
    new
    
     
    
    int
    
    [
    
    3
    
    ][];
 arri[
    
    0
    
    ] 
    
    =
    
     
    
    new
    
     
    
    int
    
    [] { 
    
    1
    
    , 
    
    2
    
     };
 arri[
    
    1
    
    ] 
    
    =
    
     
    
    new
    
     
    
    int
    
    [] { 
    
    3
    
     };
 arri[
    
    2
    
    ] 
    
    =
    
     
    
    new
    
     
    
    int
    
    [] { 
    
    4
    
    , 
    
    5
    
    , 
    
    6
    
     };
 
    
    int
    
     rlen
    
    =
    
    arri.Length;
 
    
    for
    
     (
    
    int
    
     i
    
    =
    
    0
    
    ; i 
    
    <
    
     rlen; i
    
    ++
    
    )
 {
 
    
    int
    
     clen 
    
    =
    
     arri[i].Length;
 
    
    for
    
     (
    
    int
    
     j 
    
    =
    
     
    
    0
    
    ; j 
    
    <
    
     clen; j
    
    ++
    
    )
 {
 Console.WriteLine(arri[i][j]);
 }
 }
 Console.Read();
   
   

foreach实现

   
   

    
    foreach
    
     (
    
    int
    
    [] i 
    
    in
    
     arri)
 {
 
    
    foreach
    
     (
    
    int
    
     j 
    
    in
    
     i)
 {
 Console.WriteLine(j);
 }
 
 }
 Console.Read();
   
   

二维数组

View Code

   
   

    
    int
    
    [,] arri 
    
    =
    
     
    
    new
    
     
    
    int
    
    [,] { { 
    
    1
    
    , 
    
    2
    
    , 
    
    3
    
    , 
    
    4
    
     }, { 
    
    5
    
    , 
    
    6
    
    , 
    
    7
    
    , 
    
    8
    
     } };
 
    
    int
    
     rlen 
    
    =
    
     arri.GetLength(
    
    0
    
    );
    
    //
    
    行数
    
    

    
     
    
    int
    
     clen 
    
    =
    
     arri.GetLength(
    
    1
    
    );
    
    //
    
    列数
    
    

    
    
 
    
    for
    
     (
    
    int
    
     i 
    
    =
    
     
    
    0
    
    ; i 
    
    <
    
     rlen; i
    
    ++
    
    )
 {
 
    
    for
    
     (
    
    int
    
     j 
    
    =
    
     
    
    0
    
    ; j 
    
    <
    
     clen; j
    
    ++
    
    )
 {
 Console.WriteLine(
    
    "
    
    第{0}行{1}列，值为{2}
    
    "
    
    , i, j, arri[i, j]);
 }
 }
 Console.Read();
   
   

运行结果：

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