我有一个函数 GetPivotedDataTable(data, "date", "id", "flag") 返回的是数据透视表格式。我想使用Task调用此方法,但如何传递多个参数到Task中。
我有一个函数 GetPivotedDataTable(data, "date", "id", "flag") 返回的是数据透视表格式。我想使用Task调用此方法,但如何传递多个参数到Task中。
您可以使用lambda表达式或Func来传递参数:)
public Form1()
{
InitializeComponent();
Task task = new Task(() => this.GetPivotedDataTable("x",DateTime.UtcNow,1,"test"));
task.Start();
}
public void GetPivotedDataTable(string data, DateTime date, int id, string flag)
{
// Do stuff
}
如果您的参数类型不同,可以使用对象数组,然后将其强制转换回原始类型。
请查看此控制台应用程序示例:
static void Main(string[] args)
{
var param1String = "Life universe and everything";
var param2Int = 42;
var task = new Task((stateObj) =>
{
var paramsArr = (object[])stateObj; // typecast back to array of object
var myParam1String = (string)paramsArr[0]; // typecast back to string
var myParam2Int = (int)paramsArr[1]; // typecast back to int
Console.WriteLine("");
Console.WriteLine(string.Format("{0}={1}", myParam1String, myParam2Int));
},
new object[] { param1String, param2Int } // package all params in an array of object
);
Console.WriteLine("Before Starting Task");
task.Start();
Console.WriteLine("After Starting Task");
Console.ReadKey();
}
你也可以使用 "params"。查看 C# 的 params 信息
public class MyClass
{
public static void UseParams(params int[] list)
{
for (int i = 0; i < list.Length; i++)
{
Console.Write(list[i] + " ");
}
Console.WriteLine();
}
public static void UseParams2(params object[] list)
{
for (int i = 0; i < list.Length; i++)
{
Console.Write(list[i] + " ");
}
Console.WriteLine();
}
static void Main()
{
// You can send a comma-separated list of arguments of the
// specified type.
UseParams(1, 2, 3, 4);
UseParams2(1, 'a', "test");
// A params parameter accepts zero or more arguments.
// The following calling statement displays only a blank line.
UseParams2();
// An array argument can be passed, as long as the array
// type matches the parameter type of the method being called.
int[] myIntArray = { 5, 6, 7, 8, 9 };
UseParams(myIntArray);
object[] myObjArray = { 2, 'b', "test", "again" };
UseParams2(myObjArray);
// The following call causes a compiler error because the object
// array cannot be converted into an integer array.
//UseParams(myObjArray);
// The following call does not cause an error, but the entire
// integer array becomes the first element of the params array.
UseParams2(myIntArray);
}
}
/*
Output:
1 2 3 4
1 a test
5 6 7 8 9
2 b test again
System.Int32[]
*/
你可以使用元组
Task<Tuple<Tuple<Parame1,Parame2,Parame....>> Func()
{
}
var r = await Func();
r.Item1;
r.Item2;
r.Item.....