我正在编写一个程序，我正在使用此代码，
private void Form1_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar >= 48 && e.KeyChar <= 57)
{
txtbox.Text = txtbox.Text + e.KeyChar.ToString();
}
}
但我没有按下文本框上的按键。我无法找到失败原因。
答案 0 :(得分：1)
根据this，您必须将Form.KeyPreview设置为<?php
/**
* Created by PhpStorm.
* User: avivpaz
* Date: 12/25/14
* Time: 12:07 PM
*/
namespace PicoCore\Objects;
class User extends APIUser implements ConvertibleObjects
{
/**
* @var string User's Name
*/
public $name;
/**
* @var string User's Push Id
*/
public $pushId;
/**
* @var UserDevice User's device type
*/
public $userDevice;
/**
* @var double The location latitude
*/
public $latitude;
/**
* @var double The location longitude
*/
public $longitude;
public function __construct()
{
$this->label = USER_LABEL;
}
/**
* init with APIUser
* @param $APIUser APIUser
* @return User type
*/
public static function withAPIUser($APIUser)
{
$user = new User();
$user->label=USER_LABEL;
$user->id = $APIUser->id;
$user->facebookAccessToken = $APIUser->facebookAccessToken;
$user->picoAccessToken = $APIUser->picoAccessToken;
$user->accessTokenExpires = $APIUser->accessTokenExpires;
return $user;
}
public function ConvertObjectToCypherSyntax()
{
return '{id:"' . $this->id . '",name:"' . $this->name . '",picoAccessToken:"' . $this->picoAccessToken . '",accessTokenExpires:"' . $this->accessTokenExpires->getTimestamp() . '",latitude:' . $this->latitude . ',longitude:' . $this->longitude . '}';
}
static public function ConvertNodeToObject($results)
{
$user = new User();
if (is_null($results))
return $user;
$user->id = $results->getProperty('id');
$user->name = $results->getProperty('name');
$user->picoAccessToken = $results->getProperty('picoAccessToken');
$user->latitude = $results->getProperty('latitude');
$user->longitude = $results->getProperty('longitude');
// $user->userDevice = UserDevice::ConvertNodeToObject($results['userDevice']);
if (!$results->getProperty('accessTokenExpires') == "")
$user->accessTokenExpires = getDateTimeFromTimeStamp($results->getProperty('accessTokenExpires'));
return $user;
}
static public function ConvertArrayToObject($array) {
$user = new User();
if (array_key_exists("id", $array))
$user->id = $array["id"];
if (array_key_exists("name", $array))
$user->name = $array["name"];
if (array_key_exists("pico_access_token", $array))
$user->picoAcceessToken = $array["pico_access_token"];
if (array_key_exists("access_token_expires", $array))
$user->accessTokenExpires = getDateTimeFromString($array["access_token_expires"]);
if (array_key_exists("device_type", $array))
$user->deviceType = $array["device_type"];
if (array_key_exists("latitude", $array))
$user->latitude = $array["latitude"];
if (array_key_exists("longitude", $array))
$user->longitude = $array["longitude"];
if (array_key_exists("userDevice", $array))
$user->userDevice = UserDevice::ConvertArrayToObject($array["userDevice"]);
return $user;
}
public function toArray()
{
$user = array();
if (!empty($this->id))
$user["id"] = $this->id;
if (!empty($this->name))
$user["name"] = urldecode($this->name);
if (!empty($this->picoAccessToken))
$user["pico_access_token"] = $this->picoAccessToken;
if (!empty($this->accessTokenExpires))
$user["access_token_expires"] = getMysqlDateTime($this->accessTokenExpires);
if (!empty($this->latitude))
$user["latitude"] = $this->latitude;
if (!empty($this->longitude))
$user["longitude"] = $this->longitude;
if (isset($this->userDevice)) {
$userDevice = $this->userDevice->toArray();
if (!empty($userDevice))
$user["userDevice"] = $userDevice;
}
if (count($user) > 0)
return $user;
return null;
}
}
，默认为false。否则，您无法处理表单的true事件。
当此属性设置为
KeyPress时，表单将收到所有true，KeyPress和KeyDown个事件。