在不知道类型或不使用混合类型数组的情况下分配SqlParameter.Value

Question

I've got a data layer I'm working on that calls into a database three times with three different stored procedures. I initially created three different functions to retrieve three dimensionalities of results. The first returns a single value, the second an entire row, and the third a table. They also take in different parameters. The first takes two varchars, the second two ints, and the last three varchars. If I try to get fancy and merge it all down as shown below, am I going to have problems?

public void CallStoredProcedure(string[] astrParams, string strConnectionString, string strStoredProcedure)
{
    int nParams = 0;
    SqlParameter[] asqlParams;
    asqlParams = SqlHelperParameterCache.GetSpParameterSet(strConnectionString, strStoredProcedure);
    foreach (string strParam in astrParams)
    {
        asqlParams[nParams].Value = strParam;
        nParams++;
    }
}

Alternately, can I use an array of mixed data types without know what is in there, and can I assign different types into the same array, replacing elements?

object[] aParams;
string strName = "Joe";
long lngHeight = 180;
object[0] = strName;
object[1] = lngHeight;
CallStoredProcedure(aParams, strConnectionString, "StoredProcedure1")

long lngWeight = 3;
string strItemName = "Bookend";
object[0] = lngWeight;
object[1] = strItemName;
CallStoredProcedure(aParams, strConnectionString, "StoredProcedure2")

And then change the code inside that function to:

foreach (object oParam in astrParams)
{
    asqlParams[nParams].Value = oParam;
    nParams++;
}

Would I need to use ToString() in either or both of these cases? And if so, does that essentially turn them into the same thing? Like I said, right now I've got three functions that take in all the parameters correctly typed, but I'm trying to get rid of duplicate code if possible.

Answer 1

You cannot have an array of different data types, you can have an array of objects and cast the individual elements to a specific data type when saving the values to typed variable though.

Not sure where you want to use ToString() but if its when you are saving a string into an Object array there is no point but if you are saving an object to a string variable then yes you would need to do this:

string str = objectArray[0].ToString();

I would avoid this whole mess though, and follow what DJ KRAZE said and add your parameters via Parameter.AddWithValue though.

Answer 2

I was fairly confused about what I needed to do with my initial question. What I realized is that I don't need to worry about C# types when adding the parameters, since GetSpParameterSet pulls all the information I need into the SqlParameter array, and resets the array every time I call it. So my initial code:

foreach (string strParam in astrParams)
{
    asqlParams[nParams].Value = strParam;
    nParams++;
}

...will just work for my needs. There won't be any problem assigning a C# string type into an SQL int type, which was my main concern, since the languages don't have identical types anyway. I know that I won't have to worry about anything like an "x" going into an int type because all the values I'm using are being pulled from the properly typed columns in other SQL queries already. So I won't need any object arrays.