public static void MsgSendMessage() {
        string conv_id = ""; // c2c 消息会话 ID 为 userID，群消息会话 ID 为 groupID
        Message message = new Message
        {
          message_conv_id = conv_id,
          message_conv_type = TIMConvType.kTIMConv_C2C, // 群消息为TIMConvType.kTIMConv_Group
          message_elem_array = new List<Elem>
          {
            new Elem
            {
              elem_type = TIMElemType.kTIMElem_Text,
              text_elem_content =  "这是一个普通文本消息"
            }
          }
        };
        StringBuilder messageId = new StringBuilder(128);

        TIMResult res = TencentIMSDK.MsgSendMessage(conv_id, TIMConvType.kTIMConv_C2C, message, messageId, (int code, string desc, 						string json_param, string user_data)=>{
          // 消息发送异步结果
        });
              // 消息发送同步返回的消息ID messageId
}

public static void MsgSendMessage() {
        string conv_id = ""; // c2c 消息会话 ID 为 userID，群消息会话 ID 为 groupID
        Message message = new Message
        {
          message_conv_id = conv_id,
          message_conv_type = TIMConvType.kTIMConv_C2C, // 群消息为TIMConvType.kTIMConv_Group
          message_elem_array = new List<Elem>
          {
            new Elem
            {
              elem_type = TIMElemType.kTIMElem_Image,
              image_elem_orig_path =  "/Users/xxx/xxx.png", // 文件绝对路径
              image_elem_level = TIMImageLevel.kTIMImageLevel_Orig // 原图发送
            }
          }
        };
        StringBuilder messageId = new StringBuilder(128);

        TIMResult res = TencentIMSDK.MsgSendMessage(conv_id, TIMConvType.kTIMConv_C2C, message, messageId, (int code, string desc, string json_param, string user_data)=>{
          // 消息发送异步结果
        });
              // 消息发送同步返回的消息ID messageId
}

public static void MsgSendMessage() {
        string conv_id = ""; // c2c 消息会话 ID 为 userID，群消息会话 ID 为 groupID
        Message message = new Message
        {
          message_conv_id = conv_id,
          message_conv_type = TIMConvType.kTIMConv_C2C, // 群消息为TIMConvType.kTIMConv_Group
          message_elem_array = new List<Elem>
          {
            new Elem
            {
              elem_type = TIMElemType.kTIMElem_Sound,
              sound_elem_file_path =  "/Users/xxx/xxx.mp3", // 文件绝对路径
              sound_elem_file_size = 10  // 语音时长

            }
          }
        };
        StringBuilder messageId = new StringBuilder(128);

        TIMResult res = TencentIMSDK.MsgSendMessage(conv_id, TIMConvType.kTIMConv_C2C, message, messageId, (int code, string desc, string json_param, string user_data)=>{
          // 消息发送异步结果
        });
              // 消息发送同步返回的消息ID messageId
}

public static void MsgSendMessage() {
        string conv_id = ""; // c2c 消息会话 ID 为 userID，群消息会话 ID 为 groupID
        Message message = new Message
        {
          message_conv_id = conv_id,
          message_conv_type = TIMConvType.kTIMConv_C2C, // 群消息为TIMConvType.kTIMConv_Group
          message_elem_array = new List<Elem>
          {
            new Elem
            {
              elem_type = TIMElemType.kTIMElem_Video,
              video_elem_video_path =  "/Users/xxx/xxx.mp4", // 文件绝对路径
              video_elem_video_type = "mp4",  // 视频类型
              video_elem_video_duration = 10, // 视频时长

              video_elem_image_path = "本地视频封面文件绝对路径",
              video_elem_image_type = "png", // 视频截图文件类型
              video_elem_image_size = 100, // 视频截图文件大小
              video_elem_image_width = 1920, // 视频截图文件宽
              video_elem_image_height = 1080, // 视频截图文件高
            }
          }
        };
        StringBuilder messageId = new StringBuilder(128);

        TIMResult res = TencentIMSDK.MsgSendMessage(conv_id, TIMConvType.kTIMConv_C2C, message, messageId, (int code, string desc, string json_param, string user_data)=>{
          // 消息发送异步结果
        });
              // 消息发送同步返回的消息ID messageId
}

public static void MsgSendMessage() {
        string conv_id = ""; // c2c 消息会话 ID 为 userID，群消息会话 ID 为 groupID
        Message message = new Message
        {
          message_conv_id = conv_id,
          message_conv_type = TIMConvType.kTIMConv_C2C, // 群消息为TIMConvType.kTIMConv_Group
          message_elem_array = new List<Elem>
          {
            new Elem
            {
              elem_type = TIMElemType.kTIMElem_File,
              file_elem_file_path =  "/Users/xxx/xxx.x", // 文件绝对路径
              file_elem_file_name = "文件名",
            }
          }
        };
        StringBuilder messageId = new StringBuilder(128);

        TIMResult res = TencentIMSDK.MsgSendMessage(conv_id, TIMConvType.kTIMConv_C2C, message, messageId, (int code, string desc, string json_param, string user_data)=>{
          // 消息发送异步结果
        });
              // 消息发送同步返回的消息ID messageId
}

public static void MsgSendMessage() {
        string conv_id = ""; // c2c 消息会话 ID 为 userID，群消息会话 ID 为 groupID
        Message message = new Message
        {
          message_conv_id = conv_id,
          message_conv_type = TIMConvType.kTIMConv_C2C, // 群消息为TIMConvType.kTIMConv_Group
          message_elem_array = new List<Elem>
          {
            new Elem
            {
              elem_type = TIMElemType.kTIMElem_Location,
              location_elem_desc =  "深圳市南山区深南大道", // 位置信息摘要
              location_elem_longitude = 34, // 经度
              location_elem_latitude = 20 // 纬度
            }
          }
        };
        StringBuilder messageId = new StringBuilder(128);

        TIMResult res = TencentIMSDK.MsgSendMessage(conv_id, TIMConvType.kTIMConv_C2C, message, messageId, (int code, string desc, string json_param, string user_data)=>{
          // 消息发送异步结果
        });
              // 消息发送同步返回的消息ID messageId
}

public static void MsgSendMessage() {
        string conv_id = ""; // c2c 消息会话 ID 为 userID，群消息会话 ID 为 groupID
        Message message = new Message
        {
          message_conv_id = conv_id,
          message_conv_type = TIMConvType.kTIMConv_C2C, // 群消息为TIMConvType.kTIMConv_Group
          message_elem_array = new List<Elem>
          {
            new Elem
            {
              elem_type = TIMElemType.kTIMElem_Face,
              face_elem_index = 0,
              face_elem_buf = ""
            }
          }
        };
        StringBuilder messageId = new StringBuilder(128);

        TIMResult res = TencentIMSDK.MsgSendMessage(conv_id, TIMConvType.kTIMConv_C2C, message, messageId, (int code, string desc, string json_param, string user_data)=>{
          // 消息发送异步结果
        });
              // 消息发送同步返回的消息ID messageId
}

public static void MsgSendMessage() {
        string conv_id = ""; // c2c 消息会话 ID 为 userID，群消息会话 ID 为 groupID
        Message message = new Message
        {
          message_conv_id = conv_id,
          message_conv_type = TIMConvType.kTIMConv_C2C, // 群消息为TIMConvType.kTIMConv_Group
          message_elem_array = new List<Elem>
          {
            new Elem
            {
              elem_type = TIMElemType.kTIMElem_Custom,
              custom_elem_data = "",
              custom_elem_desc = "",
              custom_elem_ext = ""
            }
          }
        };
        StringBuilder messageId = new StringBuilder(128);

        TIMResult res = TencentIMSDK.MsgSendMessage(conv_id, TIMConvType.kTIMConv_C2C, message, messageId, (int code, string desc, string json_param, string user_data)=>{
          // 消息发送异步结果
        });
              // 消息发送同步返回的消息ID messageId
}