本篇文章給大家帶來的內容是關于MySQL如何通過實例化對象參數查詢數據 ？(源代碼)，有一定的參考價值，有需要的朋友可以參考一下，希望對你有所幫助。public static string QueryByEntity(T t) where T : new(){string resultstr = string.Empty;MySqlDataReader reader = null;try{Type type = typeof(T);PropertyInfo[] properties = type.GetProperties();string select = string.Format("Select * from {0} {1}", type.Name, "{0}");string where = string.Empty;foreach (PropertyInfo property in properties){var value = t.GetPropertyValue(property);if (value != null && !value.Equals(property.GetDefaultValue())){if (string.IsNullOrEmpty(where)){where = string.Format(" where {0}='{1}' ", property.Name, value);}else{where = string.Format(" {0} and {1} = '{2}' ", where, property.Name, value);}}}select = string.Format(select, where);MySqlConnection connection = OpenConnection();if (connection == null)return resultstr;MySqlCommand _sqlCom = new MySqlCommand(select, connection);reader = _sqlCom.ExecuteReader();List tList = new List();while (reader.Read()){T t1 = new T();foreach (PropertyInfo property in properties){if (!string.IsNullOrEmpty(reader[property.Name].ToString())){property.SetMethod.Invoke(t1, new object[] { reader[property.Name] });}}tList.Add(t1);}resultstr = JsonConvert.SerializeObject(tList);}catch (Exception ex){Logging.Error(string.Format("查詢數據庫失敗，{0}", ex.Message));}finally{if (reader != null){reader.Close();reader.Dispose();}}return resultstr;}internal static class ObjectExtend{public static object GetPropertyValue(this object obj, PropertyInfo property){Type type = typeof(T);PropertyInfo propertyInfo = type.GetProperty(property.Name);if (propertyInfo != null){return propertyInfo.GetMethod.Invoke(obj, null);}return null;}public static object GetDefaultValue(this PropertyInfo property){return property.PropertyType.IsValueType ? Activator.CreateInstance(property.PropertyType) : null;}}通過實例化參數，對屬性賦值，將對象作為參數傳入，反射獲取對象名稱，列名，列值。要求對象名與表名一致，屬性與列名一致。

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