C＃参考数组赋值问题

Question

我在从数据库中读取值并将其分配给数组时遇到了一些问题。它似乎在我的单元测试中工作，但实际上有些值不翼而飞。

这里是我的数据库代码：

private void GetParameterValuesFromDatabase() 
{ 
     this.parameterValues = (from DataRow r in this.database.RunCommand("select * from KST_PARAM_VALUES v join DM_PARM_NAME p on v.PARM_NAME_KEY = p.PARM_NAME_KEY").Rows 
           where (int)r["SCENARIO_KEY"] == this.scenario.ScenarioKey 
           select new DatabaseParameter 
           { 
            ParameterValuesKey = r.Field<int>(0), 
            ProfileType = r.Field<string>(1), 
            ScenarioKey = r.Field<int>(2), 
            StressEditorKey = r.Field<int>(3), 
            StressClassKey = r.Field<int>(4), 
            PeriodKey = r.Field<int>(5), 
            ParameterNameKey = r.Field<int>(6), 
            ParameterValue = r.Field<double>(7), 
            ActiveStress = (r.Field<string>(8) == "Y") ? true : false, 
            ParameterKey = (int)r["PARM_NUMBER"] 
           }).ToDictionary(r => r.ParameterValuesKey, r => r); 
    } 

由于没有与我的这部分代码的任何问题，只是显示的完整性。

private void LoadParameters() 
{ 
    this.GetParameterValuesFromDatabase(); 

    // TODO: Assuming 9 periods for now, change to allow for variable periods 
    for (int i = 1; i <= MaxNumberOfStressPeriods; i++) 
    { 
     this.parametersByPeriod.Add(i, this.parameterValues.Where(t => t.Value.PeriodKey == i).ToDictionary(t => t.Key, t => t.Value)); 
    } 

    Log.Instance.LogMessage(LogLevel.Debug, "Created parameter dictionaries from database"); 

    // For every stress editor in the dictionary of stress editors 
    foreach (KeyValuePair<int, ClassList> ed in this.stressParams) 
    { 
      // For every type of class selector 
      foreach (ClassSelector c in Enum.GetValues(typeof(ClassSelector))) 
      { 
       // For each of the classes within each class list within the editor 
       for (int i = 0; i < ed.Value.ClassLists[c].Count; i++) 
       { 
        string className = ed.Value.ClassLists[c][i].Name; 

       // For each double array in each class 
        foreach (KeyValuePair<int, double[]> t in ed.Value.ClassLists[c][i].ClassVariables.EditorParameters) 
        { 
         double[] values = this.GetParameterValues(t.Key, ed.Key, className); 

         BasicStressEditorVariables.AddParameters(values, ed.Value, className, t.Key); 
        } 
       } 
      } 
     } 
    } 
} 

上面显示了整个LoadParameters（）方法。 下面我们有一些代码从数据库构建的字典中选择9个值，随时可以添加到数组中。

private double[] GetParameterValues(int paramKey, int editorKey, string className) 
{ 
    double[] values = new double[9]; 

    for (int i = 1; i <= MaxNumberOfStressPeriods; i++) 
    { 
     Dictionary<int, DatabaseParameter> temp = this.parametersByPeriod[i]; 

     foreach (KeyValuePair<int, DatabaseParameter> d in temp) 
     { 
      if (d.Value.ParameterKey == paramKey && d.Value.PeriodKey == i && d.Value.StressEditorKey == editorKey && d.Value.ProfileType == className) 
      { 
       values[i - 1] = d.Value.ParameterValue; 
      } 
     } 
    } 

    return values; 
} 

下图为正从词典中的目标数组，因为索引不能引用

public static void AddParameters(double[] values, ClassList editor, string className, int paramKey) 
{ 
    // TODO: Maybe search all lists to eliminate the need for the class selector as a parameter 
    // TODO: Will throw an exception when nothing is found. Handle it 
    ParameterClass p = null; 

    foreach (ClassSelector c in Enum.GetValues(typeof(ClassSelector))) 
    { 
     p = editor.ClassLists[c].FirstOrDefault(f => f.Name == className); 

     if (p != null) 
     { 
       break; 
     }     
    } 
    // TODO: Notify that could not be found 
    if (p == null) 
    { 
     Log.Instance.LogMessage(LogLevel.Error, $"Unable to find class {className}"); 
     return; 
    } 

    double[] dest = p.ClassVariables.editorParameters[paramKey]; 

    AddParameterValues(values, ref dest); 
} 

传递而这里的AddParameterValues（）方法：

private static void AddParameterValues(double[] values, ref double[] destination) 
{ 
    if (values.Length != destination.Length) 
    { 
     return; 
    } 

    for (int i = 0; i < values.Length; i++) 
    { 
     destination[i] = values[i]; 
    } 
} 

调试表明一些值正被加载到目标数组中，但有些不是。谁能告诉我这是为什么？或者，如果没有，指向我的某些材料？

谢谢您的时间

Answer 1

我不是C＃专家，但希望下面的代码为C程序员

private double[] GetParameterValues(int paramKey, int editorKey, string className) 
{ 
    double[] values = new double[9]; 
    //...  
    return values; 
} 

我会假设，值的寿命仅在函数GetParameterValues和函数GetParameterValues传递调用者参考死变量。 如果更改像

private void GetParameterValues(ref double[] values, int paramKey, int editorKey, string className)