C # Reflection iterates through all the fields of an entity, with a detailed description of the ObjectDumper class implementation

When logging, it is sometimes necessary to know the value of each field of an entity, when it is necessary to iterate through the members with reflection, to spell the string back, and if the member is still a custom type, recursive execution is required.

Implementation method:

Using system;using system.collections.generic;using system.linq;using system.text;using System.Reflection;using System.collections;namespace servertoolserver.util{public class ObjectDumper {//<summary>//        /The maximum number of bytes for this record///</summary> private static int MAXLENGTH = 16384;        <summary>////The object currently being logged///</summary> private static object lastobj = NULL; <summary>///reflect the field name and field values of obj////</summary>//<typeparam name= "T" > type to reflect </        typeparam>//<param name= "obj" > Entities </param>//<returns> field names: Field values </returns>            public static string Getobjstr (Object obj) {if (obj = = null) {return "";            } StringBuilder ret = new StringBuilder (30); fieldinfo[] fields = obj. GetType ().            GetFields (); if (fields = = NULL | | fields.           Length = = 0) {return ret.            ToString ();                    } else {foreach (FieldInfo eachfield in fields) {                Getobjstr (obj, Eachfield, ret); }} return ret.        ToString (); }///<summary>//reflect the field name of the object: Value///</summary>//<param Name= "entity" > Objects </param>//<param name= "obj" > Fields </param>///<param name= "str" > recorded STRINGBUILDER&L            t;/param> public static void Getobjstr (object entity, Object obj, StringBuilder str) {try                {////avoids infinite recursion, ensuring that an object is only recorded once if (Object.referenceequals (obj, lastobj))                {return;                } lastobj = obj;                if (entity = = NULL | | obj = = NULL) {return; } if (str. Length > Maxlength) {str.                    Append ("... to long ...");                Return                } FieldInfo f = obj as FieldInfo; String TypeName = f = = null? Obj. GetType ().                Name:f.name; Type type = F = = null? Obj.                GetType (): F.fieldtype; Object value = f = = null?                Obj:f.getvalue (entity); if (type. Isvaluetype | | Type = = typeof (String)) {if (str. Length > MAXLENGTH) {str.                        Append ("... to long ...");                    Return } str.                    Append (TypeName); Str.                    Append (":"); Str.                    Append (value); Str.                    Append ("\ r \ n");                Return ////if the member is a collection, recursively traverse if (typeof (IEnumerable).   IsAssignableFrom (type)) {IEnumerable ie = value as IEnumerable;                 if (ie = null) {IEnumerator list = ie.                        GetEnumerator (); while (list. MoveNext ()) {////basic data type or string if (list. Current.gettype (). Isvaluetype | | List. Current.gettype () = = typeof (String)) {if (str. Length > MAXLENGTH) {str.                                    Append ("... to long ...");                                Return } else {str.                                    Append (type); Str.                                    Append (":"); Str. Append (list.                                    Current); Str.                                Append ("\ r \ n"); }}////Custom type                           else {str. Append (list.                                Current.gettype ()); Str.                                Append ("."); fieldinfo[] fields = list. Current.gettype ().                                GetFields (); foreach (FieldInfo subField in fields) {if (str. Length > MAXLENGTH) {str.                                        Append ("... to long ...");                                    Return } getobjstr (list.                                Current, SubField, str);                }}}}} else {str.                    Append (type); Str.                    Append ("."); fieldinfo[] fields = type.           GetFields ();         if (fields.                    Length = = 0) {return; } foreach (FieldInfo subField in fields) {if (str. Length > MAXLENGTH) {str.                            Append ("... to long ...");                        Return                    } getobjstr (value, SubField, str);            }}} catch (Exception ex) {return; }        }    }}

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