asked on

Accessing sub list data in a C# struct

I am trying to access data that is a sub list within a datalist structure. The structure is as follows:

Field1
Field2
Field3
Field4
rawDataList (data I need to grab)
0
SubField1
0 - Value I need to get
1 - Value I need to get
2 - Value I need to get
Subfield2
Subfield3
0 - Value I need to get
1 - Value I need to get
1
SubField1
0 - Value I need to get
1 - Value I need to get
2 - Value I need to get
Subfield2
Subfield3
0 - Value I need to get
1 - Value I need to get
Field5

The following is what I thought would work but I get an error:

DateTime rTime;
            float rAmbient;
            float rTemp;
            float rVolt;

            for (int i = 0; i <= count; i++)
            {
                

                unsafe
                {
                    for (int t = 0; t <= 31; t++)
                    {
                        rTemp = _dataBase.rawDataList[i].temp[t];
                        rAmbient = _dataBase.rawDataList[i].tempAmbient;
                        rTime = _dataBase.rawDataList[i].time;
                        rVolt = _dataBase.rawDataList[i].v[t];
                      
                        rTable.Rows.Add(rTemp, rAmbient, rTime, rVolt);
                    }
                }     
            }

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This is the error I get: Fixed size buffers can only be accessed through locals or fields

VS2013 directs me to MSDN but I cannot figure out how to fix the error. The error is with the temp and v values. Any help or direction would be greatly appreciated...

TommySzalapski

Is it a requirement that they are fixed arrays in the first place?
Why not just make v and temp ArrayLists and set the size in the constructor to whatever you want it to be?

kaufmed

Why are you using the unsafe modifier?

TommySzalapski

It looks like you are trying to use an array because you used them in C++ or C. I'm guessing you added 'unsafe' because it made you do that to use the fixed arrays. You could probably also just use dynamic arrays. Use something like this to declare it

int[] temperature;

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and something like this in the constructor

temperature = new int[31];

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If you need more help, post the definition of the class.

Also note that your inner for loop is going to run 32 times. Is this intentional? I'm guessing it's for days in a month and you want < 31, not <= 31?

snieves

ASKER

It doesn't have to be in an array. The MSDN article I referenced said to create a variable and assign the in-line array to the variable. I did that and that is when I got the fixed size buffer error. The program is testing 32 modules for temp and voltage every second for a variable amount of time. I need to grab the data, the in-line array dataset and push that to SQL. The only part I'm having an issue with is getting the in-line array data. I did not generate the dataset, a different programmer handled that. Here is my code so far.

private void dbThread()
        {
            int count = _dataBase.rawDataList.Count();

            var timeStamp = DateTime.Now;
            var tID = Guid.NewGuid().ToString("N");

            // Summary data table //
            DataTable table = new DataTable();
            table.Columns.Add("ahDch", typeof(float));
            table.Columns.Add("moduleSN1", typeof(string));
            table.Columns.Add("moduleSN2", typeof(string));
            table.Columns.Add("newPackSN", typeof(string));
            table.Columns.Add("testType", typeof(string));
            table.Columns.Add("timeStamp", typeof(DateTime));
            table.Columns.Add("tID", typeof(string));
            table.Columns.Add("tIndex", typeof(string));

            for (int i = 0; i <= 31; i++)
            {
                table.Rows.Add(_dataBase.ahDch[i], _dataBase.moduleSN1[i], _dataBase.moduleSN2[i], _dataBase.newPackSN.Substring(36), _dataBase.testType, timeStamp, tID, i);
            }

            // Detail data table //
            DataTable rTable = new DataTable();
            rTable.Columns.Add("temp", typeof(float));
            rTable.Columns.Add("tempAmbient", typeof(float));
            rTable.Columns.Add("time", typeof(DateTime));
            rTable.Columns.Add("v", typeof(float));
            rTable.Columns.Add("timeStamp", typeof(DateTime));
            rTable.Columns.Add("tiD", typeof(string));
            rTable.Columns.Add("tIndex", typeof(string));

            
            float rTemp = 0;
            float rAmbient;
            DateTime rTime;
            float rVolt = 0;

            try
            {
                for (int i = 0; i <= count; i++)
                {
                    rAmbient = _dataBase.rawDataList[i].tempAmbient;
                    rTime = _dataBase.rawDataList[i].time;
                    ArrayList myArr = new ArrayList {_dataBase.rawDataList[i]};

                    unsafe
                    {
                        for (int t = 0; t <= 31; t++)
                        {
                            rTemp = myArr.temp[t]; // Does not contain a definition for temp
                            rVolt = myArr.v[t]; // Does not contain a definition for v
                            
                            rTable.Rows.Add(rTemp, rAmbient, rTime, rVolt, timeStamp, tID, i);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            
            string connectionString = "connection string";

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                using (SqlBulkCopy bulkCopy = new SqlBulkCopy(connection))
                {
                    bulkCopy.DestinationTableName = "dbo.Table1";

                    try
                    {
                         bulkCopy.WriteToServer(table);
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }

                }

                using (SqlBulkCopy bulkCopy2 = new SqlBulkCopy(connection))
                {
                    bulkCopy2.DestinationTableName = "dbo.Table2_Items";

                    try
                    {
                        bulkCopy2.WriteToServer(rTable);
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }

                }
            }

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Thank you so much for your help!!!

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TommySzalapski

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snieves

ASKER

Sorry for the delay. Worked like a charm. Thank you so much!!!