Question

想知道是否可以通过await调用返回字符串。

    public static async Task<string[]> GetCode(IEnumerable<CodeAddressContainer> codeList, int count)
    {

        string[] stringArray = new string[count];

        await Task.Run(() => Parallel.ForEach(codeList, code =>
        {
            var id = code.Id;
            var asm = code.ASM;
            var address = code.Address;

            var hexCode = CompileCodeToPairedHex(asm);

            var lines = hexCode.GetNonEmptyLineCount();

            address = GetInsertionAddress(address, lines);

            string result = address + Environment.NewLine + hexCode;

            stringArray[id] = result;
        }));

        return stringArray;
    }

如果可能的话，会更顺畅一点。我无法找到关于你可以通过它返回的价值的任何信息。

只有我有异步任务的原因只是为了能够运行方法异步。

Answer 1

这个怎么样：

    public static async Task<string[]> GetCode(IEnumerable<CodeAddressContainer> codeList, int count)
    {
        return await Task.Run<string[]>(() => codeList.AsParallel().AsOrdered().Select(code =>
        {
            var id = code.Id;
            var asm = code.ASM;
            var address = code.Address;

            var hexCode = CompileCodeToPairedHex(asm);

            var lines = hexCode.GetNonEmptyLineCount();

            address = GetInsertionAddress(address, lines);

            string result = address + Environment.NewLine + hexCode;

            return result;
        }).ToArray());
    }

Answer 2

不，你不能从Task.Run返回，因为它是一个等待的内部函数，这意味着此时控件将被发送回调用者。

但是，如果您只关心保留方法async，您可以在使用等待将IENumerable转换为列表的行中执行某些操作，其余的很容易：

public static async Task<string[]> GetCode(IEnumerable<CodeAddressContainer> codeList, int count)
{
    var list = await codeList.ToListAsync();

    string[] stringArray = new string[count];

    Parallel.ForEach(codeList, code =>
    {
        var id = code.Id;
        var asm = code.ASM;
        var address = code.Address;

        var hexCode = CompileCodeToPairedHex(asm);

        var lines = hexCode.GetNonEmptyLineCount();

        address = GetInsertionAddress(address, lines);

        string result = address + Environment.NewLine + hexCode;

        stringArray[id] = result;
    }

    return stringArray;
}

可以从＆＃34;返回字符串await Task.Run（（）=＆gt; Parallel.ForEach＆＃34;？

2 个答案: