错误 1 “robot.PostDate.LogIN(string, string, string)”: 并非所有的代码路径都返回值 F:\c#\robot\robot\PostDate.cs 10 30 robot
请问这个错误怎么解决。我是新手,刚接触c#还望各位多多指点!
public static string LogIN(string URI, string email, string password)
{
try
{
CookieContainer cookieContainer = new CookieContainer(); ///////////////////////////////////////////////////
// 1.打开 MyLogin.aspx 页面,获得 GetVeiwState & EventValidation
///////////////////////////////////////////////////
// 设置打开页面的参数
// string URI = "http://login.xiaonei.com/Login.do";
HttpWebRequest request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "GET";
request.KeepAlive = true; // 接收返回的页面
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
System.IO.Stream responseStream = response.GetResponseStream();
System.IO.StreamReader reader = new System.IO.StreamReader(responseStream, Encoding.UTF8);
string srcString = reader.ReadToEnd(); // 获取页面的 VeiwState
string viewStateFlag = "id=\"__VIEWSTATE\" value=\"";
int i = srcString.IndexOf(viewStateFlag) + viewStateFlag.Length;
int j = srcString.IndexOf("\"", i);
string viewState = srcString.Substring(i, j - i); // 获取页面的 EventValidation
string eventValidationFlag = "id=\"__EVENTVALIDATION\" value=\"";
i = srcString.IndexOf(eventValidationFlag) + eventValidationFlag.Length;
j = srcString.IndexOf("\"", i);
string eventValidation = srcString.Substring(i, j - i); ///////////////////////////////////////////////////
// 2.自动填充并提交 MyLogin.aspx 页面
///////////////////////////////////////////////////
// 提交按钮的文本
string submitButton = "登录";
// 将文本转换成 URL 编码字符串
// viewState = System.Web.HttpUtility.UrlEncode(viewState);
// eventValidation = System.Web.HttpUtility.UrlEncode(eventValidation);
// submitButton = System.Web.HttpUtility.UrlEncode(submitButton); // 要提交的字符串数据。格式形如:user=uesr1&password=123
string formatString = "email={0}&password={1}&origURL=http%3A%2F%2Fwww.xiaonei.com%2FSysHome.do";
string postString = string.Format(formatString, email, password, submitButton, viewState, eventValidation); // 将提交的字符串数据转换成字节数组
byte[] postData = Encoding.ASCII.GetBytes(postString); // 设置提交的相关参数
request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "POST";
request.KeepAlive = true;
request.ContentType = "application/x-www-form-urlencoded";
request.CookieContainer = cookieContainer;
request.ContentLength = postData.Length; // 提交请求数据
System.IO.Stream outputStream = request.GetRequestStream();
outputStream.Write(postData, 0, postData.Length);
outputStream.Close(); // 接收返回的页面
response = request.GetResponse() as HttpWebResponse;
responseStream = response.GetResponseStream();
reader = new System.IO.StreamReader(responseStream, Encoding.GetEncoding("GB2312"));
srcString = reader.ReadToEnd(); ///////////////////////////////////////////////////
// 3.打开 Default.aspx 页面
///////////////////////////////////////////////////
// 设置打开页面的参数
URI = "http://apps.xiaonei.com/happyfarm";
request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "GET";
request.KeepAlive = true;
request.CookieContainer = cookieContainer; // 接收返回的页面
response = request.GetResponse() as HttpWebResponse;
responseStream = response.GetResponseStream();
reader = new System.IO.StreamReader(responseStream, Encoding.UTF8);
srcString = reader.ReadToEnd();
return srcString;
///////////////////////////////////////////////////
// 4.分析返回的页面
///////////////////////////////////////////////////
// ...... ...... }
catch (WebException we)
{
string msg = we.Message;
}
请问这个错误怎么解决。我是新手,刚接触c#还望各位多多指点!
public static string LogIN(string URI, string email, string password)
{
try
{
CookieContainer cookieContainer = new CookieContainer(); ///////////////////////////////////////////////////
// 1.打开 MyLogin.aspx 页面,获得 GetVeiwState & EventValidation
///////////////////////////////////////////////////
// 设置打开页面的参数
// string URI = "http://login.xiaonei.com/Login.do";
HttpWebRequest request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "GET";
request.KeepAlive = true; // 接收返回的页面
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
System.IO.Stream responseStream = response.GetResponseStream();
System.IO.StreamReader reader = new System.IO.StreamReader(responseStream, Encoding.UTF8);
string srcString = reader.ReadToEnd(); // 获取页面的 VeiwState
string viewStateFlag = "id=\"__VIEWSTATE\" value=\"";
int i = srcString.IndexOf(viewStateFlag) + viewStateFlag.Length;
int j = srcString.IndexOf("\"", i);
string viewState = srcString.Substring(i, j - i); // 获取页面的 EventValidation
string eventValidationFlag = "id=\"__EVENTVALIDATION\" value=\"";
i = srcString.IndexOf(eventValidationFlag) + eventValidationFlag.Length;
j = srcString.IndexOf("\"", i);
string eventValidation = srcString.Substring(i, j - i); ///////////////////////////////////////////////////
// 2.自动填充并提交 MyLogin.aspx 页面
///////////////////////////////////////////////////
// 提交按钮的文本
string submitButton = "登录";
// 将文本转换成 URL 编码字符串
// viewState = System.Web.HttpUtility.UrlEncode(viewState);
// eventValidation = System.Web.HttpUtility.UrlEncode(eventValidation);
// submitButton = System.Web.HttpUtility.UrlEncode(submitButton); // 要提交的字符串数据。格式形如:user=uesr1&password=123
string formatString = "email={0}&password={1}&origURL=http%3A%2F%2Fwww.xiaonei.com%2FSysHome.do";
string postString = string.Format(formatString, email, password, submitButton, viewState, eventValidation); // 将提交的字符串数据转换成字节数组
byte[] postData = Encoding.ASCII.GetBytes(postString); // 设置提交的相关参数
request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "POST";
request.KeepAlive = true;
request.ContentType = "application/x-www-form-urlencoded";
request.CookieContainer = cookieContainer;
request.ContentLength = postData.Length; // 提交请求数据
System.IO.Stream outputStream = request.GetRequestStream();
outputStream.Write(postData, 0, postData.Length);
outputStream.Close(); // 接收返回的页面
response = request.GetResponse() as HttpWebResponse;
responseStream = response.GetResponseStream();
reader = new System.IO.StreamReader(responseStream, Encoding.GetEncoding("GB2312"));
srcString = reader.ReadToEnd(); ///////////////////////////////////////////////////
// 3.打开 Default.aspx 页面
///////////////////////////////////////////////////
// 设置打开页面的参数
URI = "http://apps.xiaonei.com/happyfarm";
request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "GET";
request.KeepAlive = true;
request.CookieContainer = cookieContainer; // 接收返回的页面
response = request.GetResponse() as HttpWebResponse;
responseStream = response.GetResponseStream();
reader = new System.IO.StreamReader(responseStream, Encoding.UTF8);
srcString = reader.ReadToEnd();
return srcString;
///////////////////////////////////////////////////
// 4.分析返回的页面
///////////////////////////////////////////////////
// ...... ...... }
catch (WebException we)
{
string msg = we.Message;
}
而执行了catch后,没有写这个方法的返回值。
{
try
{
....
str=
return true;
}
catch(WebException we)
{
str=we.Message;
return false
}
}如果返回true,说明登陆成功,而str就是你要的东西
如果返回false,说明登陆失败,str记录着失败(异常)的原因
{
string msg = we.Message;
return msg;
}
{
string srcString=String.Empty; try
{
CookieContainer cookieContainer = new CookieContainer(); ///////////////////////////////////////////////////
// 1.打开 MyLogin.aspx 页面,获得 GetVeiwState & EventValidation
///////////////////////////////////////////////////
// 设置打开页面的参数
// string URI = "http://login.xiaonei.com/Login.do";
HttpWebRequest request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "GET";
request.KeepAlive = true; // 接收返回的页面
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
System.IO.Stream responseStream = response.GetResponseStream();
System.IO.StreamReader reader = new System.IO.StreamReader(responseStream, Encoding.UTF8);
srcString = reader.ReadToEnd(); // 获取页面的 VeiwState
string viewStateFlag = "id=\"__VIEWSTATE\" value=\"";
int i = srcString.IndexOf(viewStateFlag) + viewStateFlag.Length;
int j = srcString.IndexOf("\"", i);
string viewState = srcString.Substring(i, j - i); // 获取页面的 EventValidation
string eventValidationFlag = "id=\"__EVENTVALIDATION\" value=\"";
i = srcString.IndexOf(eventValidationFlag) + eventValidationFlag.Length;
j = srcString.IndexOf("\"", i);
string eventValidation = srcString.Substring(i, j - i); ///////////////////////////////////////////////////
// 2.自动填充并提交 MyLogin.aspx 页面
///////////////////////////////////////////////////
// 提交按钮的文本
string submitButton = "登录";
// 将文本转换成 URL 编码字符串
// viewState = System.Web.HttpUtility.UrlEncode(viewState);
// eventValidation = System.Web.HttpUtility.UrlEncode(eventValidation);
// submitButton = System.Web.HttpUtility.UrlEncode(submitButton); // 要提交的字符串数据。格式形如:user=uesr1&password=123
string formatString = "email={0}&password={1}&origURL=http%3A%2F%2Fwww.xiaonei.com%2FSysHome.do";
string postString = string.Format(formatString, email, password, submitButton, viewState, eventValidation); // 将提交的字符串数据转换成字节数组
byte[] postData = Encoding.ASCII.GetBytes(postString); // 设置提交的相关参数
request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "POST";
request.KeepAlive = true;
request.ContentType = "application/x-www-form-urlencoded";
request.CookieContainer = cookieContainer;
request.ContentLength = postData.Length; // 提交请求数据
System.IO.Stream outputStream = request.GetRequestStream();
outputStream.Write(postData, 0, postData.Length);
outputStream.Close(); // 接收返回的页面
response = request.GetResponse() as HttpWebResponse;
responseStream = response.GetResponseStream();
reader = new System.IO.StreamReader(responseStream, Encoding.GetEncoding("GB2312"));
srcString = reader.ReadToEnd(); ///////////////////////////////////////////////////
// 3.打开 Default.aspx 页面
///////////////////////////////////////////////////
// 设置打开页面的参数
URI = "http://apps.xiaonei.com/happyfarm";
request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "GET";
request.KeepAlive = true;
request.CookieContainer = cookieContainer; // 接收返回的页面
response = request.GetResponse() as HttpWebResponse;
responseStream = response.GetResponseStream();
reader = new System.IO.StreamReader(responseStream, Encoding.UTF8);
srcString = reader.ReadToEnd();
///////////////////////////////////////////////////
// 4.分析返回的页面
///////////////////////////////////////////////////
// ...... ...... }
catch (WebException we)
{
string msg = we.Message;
}
return srcString;
}
{
string msg = we.Message;
return "";
}
还有就是srcString的作用域写在TRY块外面也可以,函数返回值必须是在函数域里面才可以...
//你的函数一定要有返回值的
try
{
......
return
}
catch
{
//或者return
//或者抛出异常
}
catch (WebException we)
{
string msg = we.Message;
}
改成:
catch (WebException we)
{
return we.Message;
}