如何將Var從C＃轉換為VB？

Question

我找到了以下對我有用的C＃代碼：

public partial class Default2 : System.Web.UI.Page 
  { 
    protected void Page_Load(object sender, EventArgs e) 
    { 
        if (Session["EID"] != null) 
        { 
            int EmpID = (int)Session["EID"]; 

            DataClassesDataContext dc = new DataClassesDataContext(); 
            var empInfo = from emp in dc.EmployeeLogins 
                          where emp.EmployeeID == EmpID 
                          select new
                          { 
                                     emp.EmployeeLoginKey, 
                                     emp.EmployeeID, 
                                     emp.username, 
                                     emp.passwd 
                          }; 

           foreach (var v in empInfo) 
           { 
               lblID.Text = v.EmployeeID.ToString(); 
               lblLoginKey.Text = v.EmployeeLoginKey.ToString(); 
               lblPassword.Text = v.passwd.ToString(); 
               lblUserName.Text = v.username.ToString(); 

            } 
       } 
       else 
       { 
           Response.Redirect("Default.aspx"); 
        } 
    } 
} 

我曾使用轉換為vb的在線轉換器，當我編譯程序時，它返回以下句子的錯誤：

For Each v As var In empInfo

如何將var從c＃轉換為vb？

Answer 1

只需跳過類型聲明： For Each v In empInfo 。

您必須設置Option Infer On 。

Formal For Each語句語法在MSDN上描述如下：

For Each element [ As datatype ] In group
    [ statements ]
    [ Continue For ]
    [ statements ]
    [ Exit For ]
    [ statements ]
Next [ element ]

Answer 2

嘗試使用此代碼：

For Each Dim item In empInfo

Answer 3

For Each v In empInfo

要讓VB推斷變量類型，只需省略As子句，例如

Dim a = b + c

注意：這僅在Option Infer為On 。 當Option Infer為Off ，沒有類型說明符的變量將默認為Object 。

Answer 4

試試吧

foreach (Dim v in empInfo) 
                lblID.Text = v.EmployeeID.ToString()
                lblLoginKey.Text = v.EmployeeLoginKey.ToString()
                lblPassword.Text = v.passwd.ToString()
                lblUserName.Text = v.username.ToString()
 Next

不要忘記在頁面頂部添加以下行

Option Strict On
Option Infer On