Question

我正试图将C#代码转换为vb.net,但我难以将C#中的“?”号改为vb.net。我的法典

 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;
 }

如何将标识“?”改为“vb.net?

我要说的是:

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

页: 1

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

但是,这部法典太长,太多的法典,你是否认为要改用短文?

Answer 1

候补操作员的直观基本合成物为If([condition,] op1, op2。

Answer 2

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

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