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+---
+prev: false
+next: true
+description: The main guide to using CSync.
+---
+
+# Guide to using CSync
+
+## 1. Creating a serializable config class
+
+To begin, we will create a new class that will inherit from `SyncedInstance`.<br>
+We must then add the `[DataContract]` attribute for this to be synced with clients.
+
+```cs
+[DataContract]
+public class Config : SyncedInstance<Config>
+```
+
+Within this class, we can now begin writing out our config entries that we want to sync.<br>
+We must also mark them with the `[DataMember]` attribute for the serializer to recognize them.
+
+```cs
+[DataContract]
+public class Config : SyncedInstance<Config> {
+    public ConfigEntry<float> DISPLAY_DEBUG_INFO { get; private set; }
+
+    [DataMember] public SyncedEntry<float> MOVEMENT_SPEED { get; private set; }
+    [DataMember] public SyncedEntry<float> CLIMB_SPEED { get; private set; }
+}
+```
+
+:::warning
+When using client side and synced entries in the same class, any instance of `ConfigEntry` should **NOT** be marked with `[DataMember]` to avoid BepInEx runtime errors.
+:::
+
+## 2. Binding config entries
+
+Before binding, we will add the following line at the top of the constructor.
+
+```cs
+InitInstance(this);
+```
+
+We can now bind our entries to the **BepInEx** config file like usual, however we will use the dedicated `BindSyncedEntry` extension method provided by **CSync**.
+
+```cs
+public Config(ConfigFile cfg) {
+    InitInstance(this);
+
+    MOVEMENT_SPEED = cfg.BindSyncedEntry("Movement", "fMovementSpeed", 4.1f,
+        "The base speed at which the player moves. This is NOT a multiplier."
+    );
+
+    CLIMB_SPEED = cfg.BindSyncedEntry("Movement", "fClimbSpeed", 3.9f,
+        "The base speed at which the player climbs. This is NOT a multiplier."
+    );
+}
+```
+
+## 3. Adding synchronization methods
+
+We will now place the following methods within the class, making sure to replace `PluginInfo.PLUGIN_GUID` if it is defined elsewhere.
+
+:::warning
+If you specify a GUID that is not unique, your mod will conflict with other mods that use **CSync**.
+:::
+
+```cs
+internal static void RequestSync() {
+    if (!IsClient) return;
+
+    using FastBufferWriter stream = new(IntSize, Allocator.Temp);
+
+    // Method `OnRequestSync` will then get called on host.
+    stream.SendMessage($"{PluginInfo.PLUGIN_GUID}_OnRequestConfigSync");
+}
+
+internal static void OnRequestSync(ulong clientId, FastBufferReader _) {
+    if (!IsHost) return;
+
+    byte[] array = SerializeToBytes(Instance);
+    int value = array.Length;
+
+    using FastBufferWriter stream = new(value + IntSize, Allocator.Temp);
+
+    try {
+        stream.WriteValueSafe(in value, default);
+        stream.WriteBytesSafe(array);
+
+        stream.SendMessage($"{PluginInfo.PLUGIN_GUID}_OnReceiveConfigSync", clientId);
+    } catch(Exception e) {
+        Plugin.Logger.LogError($"Error occurred syncing config with client: {clientId}\n{e}");
+    }
+}
+
+internal static void OnReceiveSync(ulong _, FastBufferReader reader) {
+    if (!reader.TryBeginRead(IntSize)) {
+        Plugin.Logger.LogError("Config sync error: Could not begin reading buffer.");
+        return;
+    }
+
+    reader.ReadValueSafe(out int val, default);
+    if (!reader.TryBeginRead(val)) {
+        Plugin.Logger.LogError("Config sync error: Host could not sync.");
+        return;
+    }
+
+    byte[] data = new byte[val];
+    reader.ReadBytesSafe(ref data, val);
+
+    try {
+        SyncInstance(data);
+    } catch(Exception e) {
+        Plugin.Logger.LogError($"Error syncing config instance!\n{e}");
+    }
+}
+```
+
+## 4. Apply Harmony patches
+
+Add in the following method and make sure the GUID is defined just like the previous step.
+
+```cs
+[HarmonyPostfix]
+[HarmonyPatch(typeof(PlayerControllerB), "ConnectClientToPlayerObject")]
+public static void InitializeLocalPlayer() {
+    if (IsHost) {
+        MessageManager.RegisterNamedMessageHandler($"{PluginInfo.PLUGIN_GUID}_OnRequestConfigSync", OnRequestSync);
+        Synced = true;
+
+        return;
+    }
+
+    Synced = false;
+    MessageManager.RegisterNamedMessageHandler($"{PluginInfo.PLUGIN_GUID}_OnReceiveConfigSync", OnReceiveSync);
+    RequestSync();
+}
+```
+
+Finally, we need to make sure the client reverts back to their own config upon leaving.
+
+```cs
+[HarmonyPostfix]
+[HarmonyPatch(typeof(GameNetworkManager), "StartDisconnect")]
+public static void PlayerLeave() {
+    Config.RevertSync();
+}
+```
+
+## Finalizing and Publishing
+
+It is recommended you inform **BepInEx** that you depend upon **CSync**.<br>
+You can do this by adding a `BepInDependency` attribute and specifying the GUID of this library.
+
+```cs
+[BepInPlugin(PluginInfo.PLUGIN_GUID, PluginInfo.PLUGIN_NAME, PluginInfo.PLUGIN_VERSION)]
+[BepInDependency("io.github.CSync")] // [!code ++]
+public class MyPlugin : BaseUnityPlugin
+```
+
+If you plan to upload your mod to **Thunderstore**, make sure you also specify the dependency within your `manifest.json` file by adding its **Thunderstore** ID to the array.
+
+```json
+"dependencies": ["BepInEx-BepInExPack-5.4.2100", "Owen3H-CSync-1.0.8"]
+```
+
+:::info NOTE
+Please ensure your manifest contains the latest version, the one seen above may be outdated!
+:::