var uri = ContactsContract.Contacts.ContentUri; 

string[] projection = { 

ContactsContract.Contacts.InterfaceConsts.DisplayName 

}; 

var cursor = ContentResolver.Query(uri, projection, null, null, null); 

if (cursor.MoveToFirst ()) { 

Console.WriteLine(cursor.GetString (cursor.GetColumnIndex (projection [0]))); 

} 

var values = new ContentValues (); 

values.Put (ContactsContract.Contacts.InterfaceConsts.DisplayName, "Mao mao yu"); 

ContentResolver.Update (ContactsContract.Profile.ContentRawContactsUri,values, null, null); 

bool ReadBackName() 

{ 

 Android.Net.Uri uri = ContactsContract.Profile.ContentUri; 

 string[] projection = { ContactsContract.Contacts.InterfaceConsts.DisplayName }; 

 var cursor = ContentResolver.Query(uri, projection, null, null, null); 

 if (cursor != null) 

 { 

 if (cursor.MoveToFirst()) 

 { 

 Console.WriteLine(cursor.GetString(cursor.GetColumnIndex(projection[0]))); 

 return true; 

 } 

 } 

 return false; 

} 

void ViewProfile () 

{ 

 Intent intent = new Intent (Intent.ActionView, ContactsContract.Profile.ContentUri); 

 StartActivity (intent); 

} 

<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.READ_PROFILE" />
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_PROFILE" /> 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:background="@android:color/background_light"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent">
 <Button
 android:text="读取通讯录"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:id="@+id/btnRead" />
 <Button
 android:text="修改机主信息"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:id="@+id/btnUpdate" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:padding="15dip" /> 

using System.Collections.Generic;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Widget;
using Android.Provider;

namespace MyDemos.SrcDemos
{
 [Activity(Label = "【例12-4】读取和更新通讯录")]
 public class ch1204ReadContactActivity : ListActivity
 {
 protected override void OnCreate(Bundle savedInstanceState)
 {
 base.OnCreate(savedInstanceState);
 var uri = ContactsContract.Contacts.ContentUri;
 string[] projection = {
 ContactsContract.Contacts.InterfaceConsts.Id,
 ContactsContract.Contacts.InterfaceConsts.DisplayName
 };
 var cursor = ContentResolver.Query(uri, projection, null, null, null);
 var contactList = new List<string>();
 if (cursor.MoveToFirst())
 {
 do
 {
  contactList.Add(cursor.GetString(cursor.GetColumnIndex(projection[1])));
 } while (cursor.MoveToNext());
 } cuesor.Close();
 ListAdapter = new ArrayAdapter<string>(this, Resource.Layout.ch1204_ContactListItem, contactList);
 }
 }
}

using Android.App;
using Android.Content;
using Android.OS;
using Android.Widget;
using Android.Provider;

namespace MyDemos.SrcDemos
{
 [Activity(Label = "【例12-4】读取和更新通讯录")]
 public class ch1204ReadContactsMain : Activity
 {
 protected override void OnCreate(Bundle savedInstanceState)
 {
 base.OnCreate(savedInstanceState);
 SetContentView(Resource.Layout.ch1204_Main);

 var btnRead = FindViewById<Button>(Resource.Id.btnRead);
 btnRead.Click += delegate
 {
 StartActivity(typeof(ch1204ReadContactActivity));
 };

 var btnUpdate = FindViewById<Button>(Resource.Id.btnUpdate);
 btnUpdate.Click += delegate
 {
 NameOwner();
 if (ReadBackName())
 {
  Intent intent = new Intent(Intent.ActionView, ContactsContract.Profile.ContentUri);
  StartActivity(intent);
 }
 };
 }

 /// <summary>
 /// 定义手机机主的名字
 /// </summary>
 void NameOwner()
 {
 ContentValues values = new ContentValues();
 //将“Rainmj”插入到已存在的user profile中
 values.Put(ContactsContract.Contacts.InterfaceConsts.DisplayName, "Rainmj");
 //更新user profile
 ContentResolver.Update(ContactsContract.Profile.ContentRawContactsUri,
 values, null, null);
 }

 /// <summary>
 /// 检查“更新user profile”是否成功
 /// </summary>
 /// <returns></returns>
 bool ReadBackName()
 {
 //获取user profile的Uri
 Android.Net.Uri uri = ContactsContract.Profile.ContentUri;

 //配置投影，指定准备从user profile中读取的列
 string[] projection = {
 ContactsContract.Contacts.InterfaceConsts.DisplayName
 };

 var cursor = ContentResolver.Query(uri, projection, null, null, null);
 if (cursor != null)
 {
 if (cursor.MoveToFirst())
 {  cursor.Close();
  //Console.WriteLine(cursor.GetString(cursor.GetColumnIndex(projection[0])));
  return true;
 }
 }
 return false;
 }
 }
}