error CS0266: Cannot implicitly convert type 'object' to 'int'

问题

error CS0266: Cannot implicitly convert type 'object' to 'int'. An explicit conversion exists (are you missing a cast?)

int dd= 6000;
sqlCmdDefaultTime = new SqlCommand("myQuery", sqlCon);
sqlDefaultTime = sqlCmdDefaultTime.ExecuteReader();
while (sqlDefaultTime.Read())
{
      dd= sqlDefaultTime[1];
}

how can i cast

回答1:

Simple cast to int:

dd = (int)sqlDefaultTime[1];

回答2:

Try this...

int.TryParse(sqlDefaultTime[1].ToString(), out dd);

in the event that the parse is successful dd will now be a new value.

Unless of course the object is an int already, the you can just cast it...

dd = (int)sqlDefaultTime[1];

回答3:

Instead of the indexer try to use the GetXXX methods of SqlDataReader:

dd = sqlDefaultTime.GetInt32(1);

More GetXXX methods here: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldatareader.aspx

回答4:

Integer.parseInt();

a few others such as TryParse and TryParseExact provide more functionality and control.

dd= Integer.parseInt(sqlDefaultTime[1]); 

should do it, provided you can guarantee the value being returned is always an int.

来源：https://stackoverflow.com/questions/8894984/error-cs0266-cannot-implicitly-convert-type-object-to-int