Question

有没有好的方法遍历redis里面的所有key

Answer 1

由于数据结构特殊性，NameValueCollection 只提供Key的遍历，不提供Value的遍历。必须先知道Key，然后再通过Key取Values。 以下是MSDN的示例。 using System; using System.Collections; using System.Collections.Specialized; public class SamplesNameValueCollection { public static void Main() { // Creates and initializes a new NameValueCollection. NameValueCollection myCol = new NameValueCollection(); myCol.Add( "red", "rojo" ); myCol.Add( "green", "verde" ); myCol.Add( "blue", "azul" ); myCol.Add( "red", "rouge" ); // Displays the values in the NameValueCollection in two different ways. Console.WriteLine( "Displays the elements using the AllKeys property and the Item (indexer) property:" ); PrintKeysAndValues( myCol ); Console.WriteLine( "Displays the elements using GetKey and Get:" ); PrintKeysAndValues2( myCol ); // Gets a value either by index or by key. Console.WriteLine( "Index 1 contains the value {0}.", myCol[1] ); Console.WriteLine( "Key \"red\" has the value {0}.", myCol["red"] ); Console.WriteLine(); // Copies the values to a string array and displays the string array. String[] myStrArr = new String[myCol.Count]; myCol.CopyTo( myStrArr, 0 ); Console.WriteLine( "The string array contains:" ); foreach ( String s in myStrArr ) Console.WriteLine( " {0}", s ); Console.WriteLine(); // Searches for a key and deletes it. myCol.Remove( "green" ); Console.WriteLine( "The collection contains the following elements after removing \"green\":" ); PrintKeysAndValues( myCol ); // Clears the entire collection. myCol.Clear(); Console.WriteLine( "The collection contains the following elements after it is cleared:" ); PrintKeysAndValues( myCol ); } public static void PrintKeysAndValues( NameValueCollection myCol ) { IEnumerator myEnumerator = myCol.GetEnumerator(); Console.WriteLine( " KEY VALUE" ); foreach ( String s in myCol.AllKeys ) Console.WriteLine( " {0,-10} {1}", s, myCol[s] ); Console.WriteLine(); } public static void PrintKeysAndValues2( NameValueCollection myCol ) { Console.WriteLine( " [INDEX] KEY VALUE" ); for ( int i = 0; i < myCol.Count; i++ ) Console.WriteLine( " [{0}] {1,-10} {2}", i, myCol.GetKey(i), myCol.Get(i) ); Console.WriteLine(); } } /* This code produces the following output. Displays the elements using the AllKeys property and the Item (indexer) property: KEY VALUE red rojo,rouge green verde blue azul Displays the elements using GetKey and Get: [INDEX] KEY VALUE [0] red rojo,rouge [1] green verde [2] blue azul Index 1 contains the value verde. Key "red" has the value rojo,rouge. The string array contains: rojo,rouge verde azul The collection contains the following elements after removing "green": KEY VALUE red rojo,rouge blue azul The collection contains the following elements after it is cleared: KEY VALUE