TaskLoggingHelper.LogError Method

public:
 void LogError(System::String ^ message, ... cli::array <System::Object ^> ^ messageArgs);

public void LogError (string message, params object[] messageArgs);

[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
public void LogError (string message, params object[] messageArgs);

member this.LogError : string * obj[] -> unit

[<System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")>]
member this.LogError : string * obj[] -> unit

Public Sub LogError (message As String, ParamArray messageArgs As Object())

Parameters

Attributes

TargetedPatchingOptOutAttribute

Exceptions

Examples

The following example shows the code for a task that creates one or more directories.

using System;
using System.IO;
using System.Security;
using System.Collections;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;

namespace Microsoft.Build.Tasks
{
    /*
     * Class: MakeDir
     *
     * An MSBuild task that creates one or more directories.
     *
     */
    public class MakeDir : Task
    {
        // The Required attribute indicates the following to MSBuild:
        //	     - if the parameter is a scalar type, and it is not supplied, fail the build immediately
        //	     - if the parameter is an array type, and it is not supplied, pass in an empty array
        // In this case the parameter is an array type, so if a project fails to pass in a value for the
            // Directories parameter, the task will get invoked, but this implementation will do nothing,
            // because the array will be empty.
        [Required]
            // Directories to create.
        public ITaskItem[] Directories
        {
            get
            {
                return directories;
            }

            set
            {
                directories = value;
            }
        }

        // The Output attribute indicates to MSBuild that the value of this property can be gathered after the
        // task has returned from Execute(), if the project has an <Output> tag under this task's element for
        // this property.
        [Output]
        // A project may need the subset of the inputs that were actually created, so make that available here.
        public ITaskItem[] DirectoriesCreated
        {
            get
            {
                return directoriesCreated;
            }
        }

        private ITaskItem[] directories;
        private ITaskItem[] directoriesCreated;

        /// <summary>
        /// Execute is part of the Microsoft.Build.Framework.ITask interface.
        /// When it's called, any input parameters have already been set on the task's properties.
        /// It returns true or false to indicate success or failure.
        /// </summary>
        public override bool Execute()
        {
            ArrayList items = new ArrayList();
            foreach (ITaskItem directory in Directories)
            {
                // ItemSpec holds the filename or path of an Item
                if (directory.ItemSpec.Length > 0)
                {
                    try
                    {
                        // Only log a message if we actually need to create the folder
                        if (!Directory.Exists(directory.ItemSpec))
                        {
                            Log.LogMessage(MessageImportance.Normal, "Creating directory " + directory.ItemSpec);
                            Directory.CreateDirectory(directory.ItemSpec);
                        }

                        // Add to the list of created directories
                        items.Add(directory);
                    }
                    // If a directory fails to get created, log an error, but proceed with the remaining
                    // directories.
                    catch (Exception ex)
                    {
                        if (ex is IOException
                            || ex is UnauthorizedAccessException
                            || ex is PathTooLongException
                            || ex is DirectoryNotFoundException
                            || ex is SecurityException)
                        {
                            Log.LogError("Error trying to create directory " + directory.ItemSpec + ". " + ex.Message);
                        }
                        else
                        {
                            throw;
                        }
                    }
                }
            }

            // Populate the "DirectoriesCreated" output items.
            directoriesCreated = (ITaskItem[])items.ToArray(typeof(ITaskItem));

            // Log.HasLoggedErrors is true if the task logged any errors -- even if they were logged
            // from a task's constructor or property setter. As long as this task is written to always log an error
            // when it fails, we can reliably return HasLoggedErrors.
            return !Log.HasLoggedErrors;
        }
    }
}

Remarks

This method is not thread-safe.

public:
 void LogError(System::String ^ subcategory, System::String ^ errorCode, System::String ^ helpKeyword, System::String ^ file, int lineNumber, int columnNumber, int endLineNumber, int endColumnNumber, System::String ^ message, ... cli::array <System::Object ^> ^ messageArgs);

public void LogError (string subcategory, string errorCode, string helpKeyword, string file, int lineNumber, int columnNumber, int endLineNumber, int endColumnNumber, string message, params object[] messageArgs);

member this.LogError : string * string * string * string * int * int * int * int * string * obj[] -> unit

Public Sub LogError (subcategory As String, errorCode As String, helpKeyword As String, file As String, lineNumber As Integer, columnNumber As Integer, endLineNumber As Integer, endColumnNumber As Integer, message As String, ParamArray messageArgs As Object())

Parameters

Exceptions

Remarks

The parameters subCategory, errorCode, helpKeyword, and file can be null.

The parameters lineNumber, columnNumber, endLineNumber, and endColumnNumber should be set to 0 if they are not available.

public:
 void LogError(System::String ^ subcategory, System::String ^ errorCode, System::String ^ helpKeyword, System::String ^ helpLink, System::String ^ file, int lineNumber, int columnNumber, int endLineNumber, int endColumnNumber, System::String ^ message, ... cli::array <System::Object ^> ^ messageArgs);

public void LogError (string subcategory, string errorCode, string helpKeyword, string helpLink, string file, int lineNumber, int columnNumber, int endLineNumber, int endColumnNumber, string message, params object[] messageArgs);

member this.LogError : string * string * string * string * string * int * int * int * int * string * obj[] -> unit

Public Sub LogError (subcategory As String, errorCode As String, helpKeyword As String, helpLink As String, file As String, lineNumber As Integer, columnNumber As Integer, endLineNumber As Integer, endColumnNumber As Integer, message As String, ParamArray messageArgs As Object())

Parameters

Exceptions