c#更新字典中的数组和循环中的元组？

Question

我对 C# 比较陌生，所以请原谅之前提出的问题。

我需要在循环中“即时”填充数组元素（例如，double[]）。我知道最大数组长度，但直到运行时才知道单个数组值。

我有这段代码初始化包含数组元组的字典。给定具有空槽的元组中的数组分配，如何在生成数据时将双精度或字符串添加到元组中的适当数组？

我在下面的代码中标记了我的问题。

public void Execute(SceneNode Parent)
{
    int maxAircraft = 10000;
    string vehicleState = "";
    double vehicleAlt;
    double vehicleVR;
    double vehicleTime;
    Dictionary<string, Tuple<double[], double[], double[], string[]>> flightData
            = new Dictionary<string, Tuple<double[], double[], double[], string[]>>(maxAircraft);

     //initializes flight state data dictionaries
     // flightList is a string[] already populated
     flightData = initializeFlightData(flightList, maxRecordCount);

//let's say that we start obtaining data for each entry in the dictionary
    foreach( var item in flightData )
    {
        //get the current values for the vehicle item at this time
        vehicleState = getVehicleStateMethod( item );
        vehicleAlt = getVehicleAltMethod( item );
        vehicleVR = getVehicleVrMethod( item );
        vehicleTime = getVehicleTimeMethod( item );
        var thisFlightData = flightData[aircraftName] as Tuple<double[], double[], double[], string[]>; 
        //------------------------------------------------------

        ***// Question: how do I progressively add the values (vehicle*)
        // to each respective array such that the arrays are updated
        // (e.g., new value at bottom) with each new set of values?
        //------------------------------------------------------***

    }
}
//------------------------------------------------------------------------
private Dictionary<string, Tuple<double[], double[], double[], string[]>> initializeFlightData(string[] flightList, int maxRecordCount)
{
//values for the arrays are unknown at this point
    double[] dt = new double[maxRecordCount];
    double[] vr = new double[maxRecordCount];
    double[] FL = new double[maxRecordCount];
    string[] altState = new string[maxRecordCount];
    var flightStateData = new Tuple<double[], double[], double[], string[]>(dt, vr, FL, altState);

    Dictionary<string, Tuple<double[], double[], double[], string[]>> flightData 
      = new Dictionary<string, Tuple<double[], double[], double[], string[]>>(flightList.Count());
    for (int i = 0; i < flightList.Count(); i++)
    {
        flightData.Add(flightList[i], flightStateData);
    }
    return flightData;
}
//----------------------------------------------------------------------------

Answer 1

要回答您的具体问题，请创建一个索引变量并使用.Item1、.Item2 等。像这样

int index = 0;
foreach( var item in flightData )
{
    //get the current values for the vehicle item at this time
    vehicleState = getVehicleStateMethod( item );
    vehicleAlt = getVehicleAltMethod( item );
    vehicleVR = getVehicleVrMethod( item );
    vehicleTime = getVehicleTimeMethod( item );
    var thisFlightData = flightData[aircraftName] as Tuple<double[], double[], double[], string[]>; 
    //------------------------------------------------------

    ***// Question: how do I progressively add the values (vehicle*)
    // to each respective array such that the arrays are updated
    // (e.g., new value at bottom) with each new set of values?
    //------------------------------------------------------***
    thisFlightData.Item1[index] = // whatever
    // repeat for each array
    index++;
}

但是，从长远来看，这是一个脆弱的解决方案，我认为您不会想要。为每个数组创建一个具有有意义名称的类。更好的是，正如@EdPlunkett 评论的那样，改用列表并将每个新项目添加到适当列表的末尾。

另请注意，您不需要在从字典中检索元组后强制转换它。