c# - 数组索引越界错误C#

Question

我有这段代码，但我收到了错误，并且无法理解为什么我收到错误。代码如下:我使用两个数组，一个字符串和一个 double (数据值及其对应的 tinestamp)。但由于某种原因，我收到错误消息:此行的索引超出范围错误:

     getSelectedItemsObj.arrayOfTimeStamp        = GetItemData(parameterName[counter], fromTime, toTime).arrayOfTimeStamp;

如果我删除这一行并且只使用 arrayOfValue 代码工作正常，但我需要两者

..........感谢快速回复，这是 GetItemData 的设置方式

 public CustomDataType GetItemData(string parameterName, string fromTime, string toTime)
    {

        getWeatherItemObj = new CustomDataType();
        // get the parameter ID
        prameterID = GetParameterInfo(parameterName).ParameterID; 
        //get the nr of items to size value arrays
        tableSize = GetTableSize(parameterName, fromTime, toTime, prameterID);
        getWeatherItemObj.arrayOfValue      = new double[tableSize];            
        getWeatherItemObj.arrayOfTimeStamp  = new string[tableSize];
        counter = 0;
        try
        {
            using (conn = new SqlConnection(connectionString))// create and open a connection object
            {
                // 1. create a command object identifying the stored procedure
                 cmd = new SqlCommand("GetItemData", conn);
                // 2.Let the command object know we will execute a stored procedure
                cmd.CommandType = CommandType.StoredProcedure;
                // 3. add the 3 parameters to command, so the can be passed to the stored procedure                  
                cmd.Parameters.Add("@ParameterName", SqlDbType.VarChar).Value    = parameterName;
                cmd.Parameters.Add("@FromTime", SqlDbType.VarChar).Value                = fromTime;
                cmd.Parameters.Add("@ToTime", SqlDbType.VarChar).Value                  = toTime;
                //open connection
                conn.Open();
                // execute the command
                reader = cmd.ExecuteReader();
                if (reader.HasRows)
                {
                    while (reader.Read())
                    {
                        getWeatherItemObj.arrayOfValue[counter]         = (double)reader["MeasurementValue"];
                        getWeatherItemObj.arrayOfTimeStamp[counter]     = reader["MeasurementDateTime"].ToString();                          
                        counter++;
                    }
                } 
                //close connection
                reader.Close();            
            }
        }
        catch (SqlException e)
        {
            Console.WriteLine("Connection failed");
            Console.WriteLine(e.Message);
            Thread.Sleep(5000);
        }           
        return getWeatherItemObj;
    }






 class CustomDataType
{
    public double[] arrayOfValue;
    public string[] arrayOfTimeStamp;

}

public CustomDataType GetSelectedtemsData(string[] parameterName, string fromTime, string toTime)
    {
        numberOfParameters = parameterName.Length;//Get the number of given parameters
        tableSize = 0;
        for (counter = 0; counter < numberOfParameters; counter++)
        {
            tableSize = tableSize + GetItemData(parameterName[counter], fromTime, toTime).arrayOfTimeStamp.Length;               
        }

        getSelectedItemsObj = new CustomDataType();

        getSelectedItemsObj.arrayOfValue        = new double[tableSize];
        getSelectedItemsObj.arrayOfTimeStamp    = new string[tableSize];
        for (counter = 0; counter < tableSize; counter++)
        { 
            getSelectedItemsObj.arrayOfValue            = GetItemData(parameterName[counter], fromTime, toTime).arrayOfValue;
            getSelectedItemsObj.arrayOfTimeStamp        = GetItemData(parameterName[counter], fromTime, toTime).arrayOfTimeStamp;

        }
        return getSelectedItemsObj;
    }

Answer 1

问题就在这里:

for (counter = 0; counter < tableSize; counter++)
{ 
     getSelectedItemsObj.arrayOfValue            = GetItemData(parameterName[counter], fromTime, toTime).arrayOfValue;
     getSelectedItemsObj.arrayOfTimeStamp        = GetItemData(parameterName[counter], fromTime, toTime).arrayOfTimeStamp;    
}

您的计数器 大小是根据tableSize 递增的，但它的使用就像是根据parameterName 的大小一样。您的代码中没有任何内容强制执行此假设，因此只要 tableSize 大于 parameterName，您就会收到所看到的错误。