Question

我正在尝试将c＃代码转换为vb.net，但我很难转换符号“？”在c＃到vb.net。这里我的代码转换

 public audit_trail Mapper(IDataReader rdr)
 {
      audit_trail audit_trail = new audit_trail();
      audit_trail.Log_id = rdr["Log_id"] is DBNull ? 0 : (int)rdr["Log_id"];            
      audit_trail.Host = rdr["Host"] is DBNull ? string.Empty : (string)rdr["Host"];
      return audit_trail;
 }

如何转换标志“？”到vb.net ??

我想转换

  audit_trail.Host = rdr["Host"] is DBNull ? string.Empty : (string)rdr["Host"];

类似

if rdr["Host"] is DBNull.Value then
  audit_trail.Host =  string.Empty 
else 
  audit_trail.Host = rdr["Host"]
end if

但代码太长，代码行太多..你们有没有想过转换成短代码？

Answer 1

三元运算符的可视基本语法是If([condition,] op1, op2)。

Answer 2

audit_trail.Host = If(IsDBNull(rdr("Host")), String.Empty, CType(rdr("Host"), String))

如何转换标志“？”在c＃到vb.net？

2 个答案: