我要评论无参数的操作：
private async task docleanup()
{
int days = (int)numretentiondays.value;
var result = messagebox.show(
$"确认删除 {days} 天前的历史数据？\n此操作不可恢复！",
"确认清理",
messageboxbuttons.yesno,
messageboxicon.warning);
if (result != dialogresult.yes) return;
btnclean.enabled = false;
progressbar.visible = true;
lblstatus.text = "正在清理中...";
await task.run(() =>
{
deletedcount = _storageservice.cleanolddata(days);
});
progressbar.visible = false;
btnclean.enabled = true;
messagebox.show(
$"清理完成！\n共删除 {deletedcount} 条历史数据。",
"清理完成",
messageboxbuttons.ok,
messageboxicon.information);
dialogresult = dialogresult.ok;
close();
}
调用的方法（按钮事件）：
btnclean.click += async (s, e) => await docleanup();
其中多线程操作为：
await task.run(() =>
{
deletedcount = _storageservice.cleanolddata(days);
});
带参数的异步操作方法：
/// <summary>
/// 云端登录验证（返回完整用户信息）
/// </summary>
public async task<cloudloginresult> cloudloginasync(string username, string password)
{
try
{
var request = new { username, password };
var content = new stringcontent(
jsonserializer.serialize(request, new jsonserializeroptions { propertynamingpolicy = jsonnamingpolicy.camelcase }),
encoding.utf8,
"application/json");
var response = await _httpclient.postasync($"{_apibaseurl}/api/v1/auth/client-login", content);
if (response.issuccessstatuscode)
{
var json = await response.content.readasstringasync();
var result = jsonserializer.deserialize<cloudloginresponse>(json, new jsonserializeroptions
{
propertynamecaseinsensitive = true
});
if (result != null && result.success && result.user != null)
{
return new cloudloginresult
{
success = true,
user = result.user
};
}
}
return new cloudloginresult { success = false, message = "用户名或密码错误" };
}
catch (exception ex)
{
return new cloudloginresult { success = false, message = $"网络异常: {ex.message}" };
}
}
调用方法：
cloudloginresult cloudresult = await _cloudsyncservice.cloudloginasync(username, password);
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