c# - 在 C# 中解析对象数组

Question

我有一个对象数组，我想将它传递给一个只接受DOUBLE、NULL或的STRING方法DATETIME。因此，当我尝试传入该值时，它会给出一个错误，指出我不能传入任何任意对象，并且必须将其解析为、DOUBLE或NULL首先。STRINGDATETIME

foreach (var currRow in dataSet.Tables[0].Rows)
{
    var tuple = Com.Tibco.As.Space.Tuple.Create();

    //here is where i loop through the object array
    for (int i = 0; i < currRow.Values.Length; i++)
    {
        //here is where i try to pass it to the method (which doesn't accept it)
        tuple.Put(dataSet.Tables[0].ColumnNames[i], currRow.Values[i]);
    }

    inSpace_.Put(tuple);
}

简而言之，我需要一种方法来解析每个对象并将其转换为适当的对象，然后将其放入元组中。

编辑：

这是我试图做的，但没有奏效：

foreach (var currRow in dataSet.Tables[0].Rows)
{
    var tuple = Com.Tibco.As.Space.Tuple.Create();

    for (int i = 0; i < currRow.Values.Length; i++)
    {
        if (currRow.Values[i] != null)
        {
            if (dataSet.Tables[0].ColumnNames[i].GetType().IsEquivalentTo(typeof(DateTime)))
            {
                DateTime value = DateTime.Parse(dataSet.Tables[0].ColumnNames[i].ToString());
                tuple.Put(dataSet.Tables[0].ColumnNames[i], value);
            }
            else if (dataSet.Tables[0].ColumnNames[i].GetType().IsEquivalentTo(typeof(Double)))
            {
                Double value = Convert.ToDouble(dataSet.Tables[0].ColumnNames[i]);
                tuple.Put(dataSet.Tables[0].ColumnNames[i], value);
            }
            else
            {
                string value = dataSet.Tables[0].ColumnNames[i].ToString();
                tuple.Put(dataSet.Tables[0].ColumnNames[i], value);
            }
        }
    }
    inSpace_.Put(tuple);
}

Answer 1

foreach (var currRow in dataSet.Tables[0].Rows)
{
    var tuple = Com.Tibco.As.Space.Tuple.Create();

    for (int i = 0; i < currRow.Values.Length; i++)
    {
        var obj = dataSet.Tables[0].ColumnNames[i], currRow.Values[i];
        var value = null;
        value = obj as double;
        if (!validObject(value)) value as string;
        if (!validObject(value)) value as DateTime;
        tuple.Put(dataSet.Tables[0].ColumnNames[i], value);
    }

    inSpace_.Put(tuple);
}

bool validObject(object obj) { return (null != obj); }

更新，根据您的编辑，我会改用开关类型：

for (int i = 0; i < currRow.Values.Length; i++)
{
    var type = obj.GetType();
    var obj = dataSet.Tables[0].ColumnNames[i], currRow.Values[i];
    var value = null;
    switch (type)
    {
        case DateTime:
            value = DateTime.Parse(obj);
            break;
        case double:
            value = Convert.ToDouble(obj);
            break;
        case string:
            value = Convert.ToString(obj);
            break;
    }
    tuple.Put(dataSet.Tables[0].ColumnNames[i], value);
}

Answer 2

如果您在编译时知道类型，请使用Convert.ToDouble,Convert.ToInt32等。如果您不知道，请使用Convert.ChangeType.