Using PropertyInfo to find out the property type

﹏ヽ暗。殇╰゛Y 2022-08-02 09:47 148阅读 0赞

[http://stackoverflow.com/questions/3723934/using-propertyinfo-to-find-out-the-property-type][http_stackoverflow.com_questions_3723934_using-propertyinfo-to-find-out-the-property-type]

[https://msdn.microsoft.com/en-us/library/system.reflection.propertyinfo.propertytype.aspx][https_msdn.microsoft.com_en-us_library_system.reflection.propertyinfo.propertytype.aspx]

public bool ValidateData(object data)
    {
        foreach (PropertyInfo propertyInfo in data.GetType().GetProperties())
        {
            if (propertyInfo.PropertyType == typeof(string))
            {
                string value = propertyInfo.GetValue(data, null);
    
                if value is not OK
                {
                    return false;
                }
            }
        }            
    
        return true;
    }

using System;
    using System.Reflection;
    
    public class Employee
    {
       private string _id;
    
       public String FirstName { get; set; }
       public String MiddleName { get; set; }
       public String LastName  { get; set; }
       public DateTime HireDate  { get; set; }
    
       public String ID
       {
          get { return _id; }
          set {
             if (ID.Trim().Length != 9)
                throw new ArgumentException("The ID is invalid");
             _id = value;
          }
       }
    }
    
    public class Example
    {
       public static void Main()
       {
          Type t = typeof(Employee);
          Console.WriteLine("The {0} type has the following properties: ",
                            t.Name);
          foreach (var prop in t.GetProperties())
             Console.WriteLine("   {0} ({1})", prop.Name,
                               prop.PropertyType.Name);
       }
    }
    // The example displays the following output: 
    //       The Employee type has the following properties: 
    //          FirstName (String) 
    //          MiddleName (String) 
    //          LastName (String) 
    //          HireDate (DateTime) 
    //          ID (String)

The following example loads an assembly given its file name or path.

Assembly SampleAssembly;
    SampleAssembly = Assembly.LoadFrom("c:\\Sample.Assembly.dll");
    // Obtain a reference to a method known to exist in assembly.
    MethodInfo Method = SampleAssembly.GetTypes()[0].GetMethod("Method1");
    // Obtain a reference to the parameters collection of the MethodInfo instance.
    ParameterInfo[] Params = Method.GetParameters();
    // Display information about method parameters. 
    // Param = sParam1 
    //   Type = System.String 
    //   Position = 0 
    //   Optional=False 
    foreach (ParameterInfo Param in Params)
    {
        Console.WriteLine("Param=" + Param.Name.ToString());
        Console.WriteLine("  Type=" + Param.ParameterType.ToString());
        Console.WriteLine("  Position=" + Param.Position.ToString());
        Console.WriteLine("  Optional=" + Param.IsOptional.ToString());
    }

This example shows how to use various reflection classes to analyze the metadata contained in an assembly.

[https://msdn.microsoft.com/en-us/library/system.reflection.assemblyname(v=vs.110).aspx][https_msdn.microsoft.com_en-us_library_system.reflection.assemblyname_v_vs.110_.aspx]

using System;
    using System.Reflection;
    
    class Module1
    {
        public static void Main()
        {
            // This variable holds the amount of indenting that  
            // should be used when displaying each line of information.
            Int32 indent = 0;
            // Display information about the EXE assembly.
            Assembly a = typeof(Module1).Assembly;
            Display(indent, "Assembly identity={0}", a.FullName);
            Display(indent+1, "Codebase={0}", a.CodeBase);
    
            // Display the set of assemblies our assemblies reference.
    
            Display(indent, "Referenced assemblies:");
            foreach (AssemblyName an in a.GetReferencedAssemblies() )
            {
                 Display(indent + 1, "Name={0}, Version={1}, Culture={2}, PublicKey token={3}", an.Name, an.Version, an.CultureInfo.Name, (BitConverter.ToString (an.GetPublicKeyToken())));
            }
            Display(indent, "");
    
            // Display information about each assembly loading into this AppDomain. 
            foreach (Assembly b in AppDomain.CurrentDomain.GetAssemblies())
            {
                Display(indent, "Assembly: {0}", b);
    
                // Display information about each module of this assembly. 
                foreach ( Module m in b.GetModules(true) )
                {
                    Display(indent+1, "Module: {0}", m.Name);
                }
    
                // Display information about each type exported from this assembly.
    
                indent += 1;
                foreach ( Type t in b.GetExportedTypes() )
                {
                    Display(0, "");
                    Display(indent, "Type: {0}", t);
    
                    // For each type, show its members & their custom attributes.
    
                    indent += 1;
                    foreach (MemberInfo mi in t.GetMembers() )
                    {
                        Display(indent, "Member: {0}", mi.Name);
                        DisplayAttributes(indent, mi);
    
                        // If the member is a method, display information about its parameters. 
    
                        if (mi.MemberType==MemberTypes.Method)
                        {
                            foreach ( ParameterInfo pi in ((MethodInfo) mi).GetParameters() )
                            {
                                Display(indent+1, "Parameter: Type={0}, Name={1}", pi.ParameterType, pi.Name);
                            }
                        }
    
                        // If the member is a property, display information about the property's accessor methods. 
                        if (mi.MemberType==MemberTypes.Property)
                        {
                            foreach ( MethodInfo am in ((PropertyInfo) mi).GetAccessors() )
                            {
                                Display(indent+1, "Accessor method: {0}", am);
                            }
                        }
                    }
                    indent -= 1;
                }
                indent -= 1;
            }
        }
    
        // Displays the custom attributes applied to the specified member. 
        public static void DisplayAttributes(Int32 indent, MemberInfo mi)
        {
            // Get the set of custom attributes; if none exist, just return. 
            object[] attrs = mi.GetCustomAttributes(false);
            if (attrs.Length==0) {return;}
    
            // Display the custom attributes applied to this member.
            Display(indent+1, "Attributes:");
            foreach ( object o in attrs )
            {
                Display(indent+2, "{0}", o.ToString());
            }
        }
    
        // Display a formatted string indented by the specified amount. 
        public static void Display(Int32 indent, string format, params object[] param) 
    
        {
            Console.Write(new string(' ', indent*2));
            Console.WriteLine(format, param);
        }
    }
    
    //The output shown below is abbreviated. 
    // 
    //Assembly identity=ReflectionCS, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null 
    //  Codebase=file:///C:/Documents and Settings/test/My Documents/Visual Studio 2005/Projects/Reflection/Reflection/obj/Debug/Reflection.exe 
    //Referenced assemblies: 
    //  Name=mscorlib, Version=2.0.0.0, Culture=, PublicKey token=B7-7A-5C-56-19-34-E0-89 
    // 
    //Assembly: mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    //  Module: mscorlib.dll 
    // 
    //  Type: System.Object 
    //    Member: GetType 
    //    Member: ToString 
    //    Member: Equals 
    //      Parameter: Type=System.Object, Name=obj 
    //    Member: Equals 
    //      Parameter: Type=System.Object, Name=objA 
    //      Parameter: Type=System.Object, Name=objB 
    //    Member: ReferenceEquals 
    //      Attributes: 
    //        System.Runtime.ConstrainedExecution.ReliabilityContractAttribute 
    //      Parameter: Type=System.Object, Name=objA 
    //      Parameter: Type=System.Object, Name=objB 
    //    Member: GetHashCode 
    //    Member: .ctor 
    //      Attributes: 
    //        System.Runtime.ConstrainedExecution.ReliabilityContractAttribute 
    // 
    //  Type: System.ICloneable 
    //    Member: Clone 
    // 
    //  Type: System.Collections.IEnumerable 
    //    Member: GetEnumerator 
    //      Attributes: 
    //        System.Runtime.InteropServices.DispIdAttribute 
    // 
    //  Type: System.Collections.ICollection 
    //    Member: CopyTo 
    //      Parameter: Type=System.Array, Name=array 
    //      Parameter: Type=System.Int32, Name=index 
    //    Member: get_Count 
    //    Member: get_SyncRoot 
    //    Member: get_IsSynchronized 
    //    Member: Count 
    //      Accessor method: Int32 get_Count() 
    //    Member: SyncRoot 
    //      Accessor method: System.Object get_SyncRoot() 
    //    Member: IsSynchronized 
    //      Accessor method: Boolean get_IsSynchronized() 
    // 
    //  Type: System.Collections.IList 
    //    Member: get_Item 
    //      Parameter: Type=System.Int32, Name=index 
    //    Member: set_Item 
    //      Parameter: Type=System.Int32, Name=index 
    //      Parameter: Type=System.Object, Name=value 
    //    Member: Add 
    //      Parameter: Type=System.Object, Name=value 
    //    Member: Contains 
    //      Parameter: Type=System.Object, Name=value 
    //    Member: Clear 
    //    Member: get_IsReadOnly 
    //    Member: get_IsFixedSize 
    //    Member: IndexOf 
    //      Parameter: Type=System.Object, Name=value 
    //    Member: Insert 
    //      Parameter: Type=System.Int32, Name=index 
    //      Parameter: Type=System.Object, Name=value 
    //    Member: Remove 
    //      Parameter: Type=System.Object, Name=value 
    //    Member: RemoveAt 
    //      Parameter: Type=System.Int32, Name=index 
    //    Member: Item 
    //      Accessor method: System.Object get_Item(Int32) 
    //      Accessor method: Void set_Item(Int32, System.Object) 
    //    Member: IsReadOnly 
    //      Accessor method: Boolean get_IsReadOnly() 
    //    Member: IsFixedSize 
    //      Accessor method: Boolean get_IsFixedSize() 
    // 
    //  Type: System.Array 
    //    Member: IndexOf 
    //      Parameter: Type=T[], Name=array 
    //      Parameter: Type=T, Name=value 
    //    Member: AsReadOnly 
    //      Parameter: Type=T[], Name=array 
    //    Member: Resize 
    //      Attributes: 
    //        System.Runtime.ConstrainedExecution.ReliabilityContractAttribute 
    //      Parameter: Type=T[]&, Name=array 
    //      Parameter: Type=System.Int32, Name=newSize 
    //    Member: BinarySearch 
    //      Attributes: 
    //        System.Runtime.ConstrainedExecution.ReliabilityContractAttribute 
    //      Parameter: Type=T[], Name=array 
    //      Parameter: Type=T, Name=value 
    //    Member: BinarySearch 
    //      Attributes: 
    //        System.Runtime.ConstrainedExecution.ReliabilityContractAttribute 
    //      Parameter: Type=T[], Name=array 
    //      Parameter: Type=T, Name=value 
    //      Parameter: Type=System.Collections.Generic.IComparer`1[T], Name=comparer

[http_stackoverflow.com_questions_3723934_using-propertyinfo-to-find-out-the-property-type]: http://stackoverflow.com/questions/3723934/using-propertyinfo-to-find-out-the-property-type
[https_msdn.microsoft.com_en-us_library_system.reflection.propertyinfo.propertytype.aspx]: https://msdn.microsoft.com/en-us/library/system.reflection.propertyinfo.propertytype.aspx
[https_msdn.microsoft.com_en-us_library_system.reflection.assemblyname_v_vs.110_.aspx]: https://msdn.microsoft.com/en-us/library/system.reflection.assemblyname%28v=vs.110%29.aspx