MVC的一些有用代码

1.将patial view转成字符串

     protected string RenderPartialViewToString(string viewName, object model)
        {
            if (string.IsNullOrEmpty(viewName))
                viewName = ControllerContext.RouteData.GetRequiredString("action");

            ViewData.Model = model;

            using (var sw = new StringWriter())
            {
                ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView(ControllerContext, viewName);
                var viewContext = new ViewContext(ControllerContext, viewResult.View, ViewData, TempData, sw);
                viewResult.View.Render(viewContext, sw);

                return sw.GetStringBuilder().ToString();
            }
        }

然而并卵用，因为完全可以返回一个 partial view

publicActionResult
GetView()

{...

return
View("viewName",model);

}



2.页面跳转

return
RedirectToAction("Action","Controller2");

return
View("ViewName");



return Index(hm);



http://stackoverflow.com/questions/11955161/view-doesnt-refresh-after-redirecttoaction-is-done



Onsuccess(function(retURL){ windows.location(retURL);})

replace windows.location(retURL) with
location.replace(retURL)

public ActionResult AddData(CandidateViewModel viewModel)
{
    var newCandidateId = 0;
    newCandidateId = this._serviceClient.AddCandidate(viewModel);
stirng ReturnURL = "/DisplayCandidate/"+newCandidateId;
    return  JSON(ReturnURL);
}

3.ModelState



ModelState["test"].Errors.Count()



View:

@Html.ValidationMessageFor(m=>m.Name)

@Html.ValidationSummary()

Model:

[Required(ErrorMessage = "Please choose the Asset Group Path.")]

[DisplayName("Name :")]

[Remote("CheckName", "Student", HttpMethod = "POST", AdditionalFields = "Id", ErrorMessage = "Student Name already exists.")]

public string Name { get; set; }

Controller:

if (ModelState.IsValid)

{}

else

{

 ModelState.AddModelError("Name", "Error Message");

}          



4.Client IP

Request.UserHostName 

Request.UserHostAddress

HttpContext.Current.User.Identity.Name

//Get IP address
                string ipStr = string.Empty;
		if ( String.IsNullOrEmpty(ipStr) || ipStr == "127.0.0.1" || ipStr == "::1")
       	     {
 		IPAddress[] arrIPAddresses = Dns.GetHostAddresses(Dns.GetHostName());
                //Request.ServerVariables["remote_addr"]  Dns.GetHostName()
                foreach (IPAddress ip in arrIPAddresses)
                {
                if (ip.AddressFamily.Equals(AddressFamily.InterNetwork)) ipStr=ip.ToString();
                }
                Session["Remote_Addr1"] = Request.ServerVariables["Remote_Addr"];
                Session["Remote_Addr2"] = Request.UserHostAddress;
                Session["Remote_Addr3"] = ipStr;}

5.string to byte[],char[]

byte[] data2 = Encoding.Unicode.GetBytes(name);

char[] values = name.ToCharArray();



6.params

        public static void LogServiceError(Exception ex, string methodName, params object[] objs)
        {
            try
            {
                Dictionary<string, string> dics = LogFormatHelper.GetLogInfo(methodName);
                LogServiceError(ex, dics,objs);
            }
            catch (Exception innerExp)
            {
                innerExp.Data.Add("Logger error", innerExp.Message);
                AppLogger.LogError(innerExp);
            }
        }

7.SqlCommand 在transaction裏面

ExecuteNonQuery requires the command to have a transaction when the connection assigned to the command is in a pending local transaction.  The Transaction property of the command has not been initialized.

using (SqlTransaction tx = destinationConnection.BeginTransaction(IsolationLevel.RepeatableRead))

                {

                    try

                    {

                        SqlCommand sqlCmd = new SqlCommand("truncate table Info", destinationConnection);

                        sqlCmd.ExecuteNonQuery();

                        。。。

 需要改成                      

SqlCommand sqlCmd = new SqlCommand("truncate table Info", destinationConnection,tx);

sqlCmd.ExecuteNonQuery();

http://stackoverflow.com/questions/13677812/error-when-using-transaction

8.SqlBulkCopy - Unexpected existing transaction

http://stackoverflow.com/questions/19117106/sqlbulkcopy-unexpected-existing-transaction

using (SqlTransaction tx = destinationConnection.BeginTransaction(IsolationLevel.RepeatableRead))

                {

                    try

                    {

                        SqlCommand sqlCmd = new SqlCommand("truncate table Info", destinationConnection,tx);

                        sqlCmd.ExecuteNonQuery();

using (SqlBulkCopy bulkCopy = new SqlBulkCopy(destinationConnection))

                        {

                            bulkCopy.DestinationTableName = "Info";

                            bulkCopy.ColumnMappings.Add("COL1", "COL1");

                            ...

需要改成

using (SqlBulkCopy bulkCopy = new SqlBulkCopy(destinationConnection,SqlBulkCopyOptions.Default,tx))

                        {

                            bulkCopy.DestinationTableName = "Info";

using (SqlConnection destinationConnection = new SqlConnection("..."))

            {

                destinationConnection.Open();

                using (SqlTransaction tx = destinationConnection.BeginTransaction(IsolationLevel.RepeatableRead))

                {

                    try

                    {

                        SqlCommand sqlCmd = new SqlCommand("truncate table Info", destinationConnection,tx);

                        sqlCmd.ExecuteNonQuery();

using (SqlBulkCopy bulkCopy = new SqlBulkCopy(destinationConnection,SqlBulkCopyOptions.Default,tx))

                        {

                            bulkCopy.DestinationTableName = "Info";

                            bulkCopy.ColumnMappings.Add("COL1", "COL1");

...

bulkCopy.WriteToServer(dt);

                        }

                        tx.Commit();

                    }

                    catch (Exception ex)

                    {

                        tx.Rollback();

                        Console.WriteLine(ex.Message);

                        AppLogger.LogError(ex);

                    }

                    finally

                    {

                        tx.Dispose();

                    }

                }

            }

db.Connection.Open();

using
(db.Transaction = db.Connection.BeginTransaction())

{

try

{...

db.SubmitChanges();

db.Transaction.Commit();

}

catch
(Exception
ex)

{

db.Transaction.Rollback();

throw
ex;

}

finally

{

db.Connection.Close();

}

9.DbHelper

public static DataSet GetDataFromCommand(string cmdText, string connectionString)
        {
            using (OleDbConnection connDbConnection = new OleDbConnection())
            {
                connDbConnection.ConnectionString = connectionString;
                connDbConnection.Open();
                OleDbCommand objCommand = new OleDbCommand();
                objCommand.CommandText = cmdText;
                objCommand.Connection = connDbConnection;
                DataSet ds = new DataSet();
                OleDbDataAdapter objAdaptor = new OleDbDataAdapter();
                objAdaptor.SelectCommand = objCommand;
                objAdaptor.Fill(ds);
                connDbConnection.Close();
                connDbConnection.Dispose();
                return ds;
            }
        }

10.StringHelper

        public static string ToTitleCase(object obj)
        {
            if (obj == null)
                return string.Empty;

            string result = System.Threading.Thread.CurrentThread.CurrentCulture.TextInfo.ToTitleCase(Convert.ToString(obj).ToLower());
            result = System.Text.RegularExpressions.Regex.Replace(result, @"\w+\&\w+", m => m.ToString().ToUpper());
            return result;
        }

11.链接

<ahref="javascript:(javascript:(void(0)))">Save</a>

12.AppDomain.CurrentDomain.BaseDirectory

string tempFolder = AppDomain.CurrentDomain.BaseDirectory + @"Temp\";

if (Directory.Exists(tempFolder)) Directory.Delete(tempFolder, true);

//string[] files = Directory.GetFiles(tempFolder, ".PDF");

//foreach (string file in files)

//{

//    System.IO.File.Delete(file);

//}



13.ReflectionHelper

public static void CopyObject(object target, object source, params string[] excludedProperties) {
            if (source == null || target == null)
            {
                throw new ArgumentNullException("source/target object");
            }
            PropertyInfo[] props = source.GetType().GetProperties();
            foreach (PropertyInfo p in props) {
                if (excludedProperties != null && excludedProperties.Contains(p.Name)) {
                    continue;   //ignore the property if exists in the specified excluded properties
                }
                if (p.CanRead && p.PropertyType.Namespace == "System") {
                    PropertyInfo targetProperty = target.GetType().GetProperty(p.Name);
                    if (targetProperty != null && p.PropertyType == targetProperty.PropertyType && targetProperty.CanWrite
                            && !AreEqual(p.GetValue(source, null), targetProperty.GetValue(target, null))){
                        targetProperty.SetValue(target, p.GetValue(source, null), null);
                    }
                }
            }
        }

14.EncryptionHelper

        public static string SHA1EncryptString(string sourceString) {
            byte[] bytes = Encoding.UTF8.GetBytes(sourceString);
            SHA1 sha = new SHA1CryptoServiceProvider();
            string encryptedString = Convert.ToBase64String(sha.ComputeHash(bytes));
            return encryptedString;
        }

15.Validate

publicclassHomeModel:IValidatableObject

{

...

publicIEnumerable<ValidationResult>
Validate(ValidationContext
validationContext)

{

if
(...)

{

yieldreturnnewValidationResult(DisplayMsgs.Error);

}

}

}

16.引用传参数

public void Sort(ref int x,ref int y,ref int z)

{

   ...//里面代码不用变

}





Myclass m = new Myclass();

int a,b,c;

a = 10;b=20;c=10;

m.Sort(ref a,ref b,ref c);

....