Verify.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / Verify.cs / 1305600 / Verify.cs
                        
                        
                            /**************************************************************************\ 
    Copyright Microsoft Corporation. All Rights Reserved.
\**************************************************************************/

namespace MS.Internal 
{
    using System; 
    using System.Diagnostics; 
    using System.Security;
    using System.Security.Permissions; 
    using System.Threading;
    using System.IO;
    using MS.Internal.WindowsBase;
 
    /// 
    /// A static class for retail validated assertions. 
    /// Instead of breaking into the debugger an exception is thrown. 
    /// 
    internal static class Verify 
    {
        /// 
        /// Ensure that the current thread's apartment state is what's expected.
        ///  
        /// 
        /// The required apartment state for the current thread. 
        ///  
        /// 
        /// The message string for the exception to be thrown if the state is invalid. 
        /// 
        /// 
        /// Thrown if the calling thread's apartment state is not the same as the requiredState.
        ///  
        public static void IsApartmentState(ApartmentState requiredState)
        { 
            if (Thread.CurrentThread.GetApartmentState() != requiredState) 
            {
                throw new InvalidOperationException(SR.Get(SRID.Verify_ApartmentState, requiredState)); 
            }
        }

        ///  
        /// Ensure that an argument is neither null nor empty.
        ///  
        /// The string to validate. 
        /// The name of the parameter that will be presented if an exception is thrown.
        public static void IsNeitherNullNorEmpty(string value, string name) 
        {
            // catch caller errors, mixing up the parameters.  Name should never be empty.
            Debug.Assert(!string.IsNullOrEmpty(name));
 
            // Notice that ArgumentNullException and ArgumentException take the parameters in opposite order :P
            if (value == null) 
            { 
                throw new ArgumentNullException(name, SR.Get(SRID.Verify_NeitherNullNorEmpty));
            } 
            if (value == "")
            {
                throw new ArgumentException(SR.Get(SRID.Verify_NeitherNullNorEmpty), name);
            } 
        }
 
        /// Verifies that an argument is not null. 
        /// Type of the object to validate.  Must be a class.
        /// The object to validate. 
        /// The name of the parameter that will be presented if an exception is thrown.
        public static void IsNotNull(T obj, string name) where T : class
        {
            if (obj == null) 
            {
                throw new ArgumentNullException(name); 
            } 
        }
 
        /// 
        /// Verifies the specified expression is true.  Throws an ArgumentException if it's not.
        /// 
        /// The expression to be verified as true. 
        /// Name of the parameter to include in the ArgumentException.
        /// The message to include in the ArgumentException. 
        public static void IsTrue(bool expression, string name, string message) 
        {
            if (!expression) 
            {
                throw new ArgumentException(message, name);
            }
        } 

        ///  
        /// Verifies two values are not equal to each other.  Throws an ArgumentException if they are. 
        /// 
        /// The actual value. 
        /// The value that 'actual' should not be.
        /// The name to display for 'actual' in the exception if this test fails.
        /// The message to include in the ArgumentException.
        public static void AreNotEqual(T actual, T notExpected, string parameterName, string message) 
        {
            if (notExpected == null) 
            { 
                // Two nulls are considered equal, regardless of type semantics.
                if (actual == null || actual.Equals(notExpected)) 
                {
                    throw new ArgumentException(SR.Get(SRID.Verify_AreNotEqual, notExpected), parameterName);
                }
            } 
            else if (notExpected.Equals(actual))
            { 
                throw new ArgumentException(SR.Get(SRID.Verify_AreNotEqual, notExpected), parameterName); 
            }
        } 

        /// 
        /// Verifies the specified file exists.  Throws an ArgumentException if it doesn't.
        ///  
        /// The file path to check for existence.
        /// Name of the parameter to include in the ArgumentException. 
        /// This method demands FileIOPermission(FileIOPermissionAccess.PathDiscovery) 
        public static void FileExists(string filePath, string parameterName)
        { 
            Verify.IsNeitherNullNorEmpty(filePath, parameterName);

            if (!File.Exists(filePath))
            { 
                throw new ArgumentException(SR.Get(SRID.Verify_FileExists, filePath), parameterName);
            } 
        } 
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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