简单的Datable转List方法

Posted 2021-01-15 skytitan

public static class DataTableUtils<T> where T : new()
    {
        public static List<T> ConvertToModel(DataTable dt)
        {
            try
            {
                if (dt == null || dt.Rows.Count == 0)
                {
                    throw new Exception("DataTable is Null!");
                }
                List<T> ts = new List<T>();
                Type type = typeof(T);
                string tempName = string.Empty;
                foreach (DataRow dr in dt.Rows)
                {
                    T t = new T();
                    // 获得此模型的公共属性  
                    PropertyInfo[] propertys = t.GetType().GetProperties();
                    foreach (PropertyInfo pi in propertys)
                    {
                        tempName = pi.Name;
                        if (dt.Columns.Contains(tempName))
                        {
                            if (!pi.CanWrite)
                                continue;
                            object value = dr[tempName];
                            if (value is DBNull)
                                continue;
                            if (pi.PropertyType.Name.ToLower() == "string")
                            {
                                if (value.GetType().Name.ToLower() == "guid")
                                {
                                    pi.SetValue(t, value.ToString(), null);
                                }
                                else if (value.GetType().Name.ToLower() == "datetime")
                                {
                                    pi.SetValue(t, Convert.ToDateTime(value).ToString("yyyy-MM-dd HH:mm:ss"), null);
                                }
                                else
                                {
                                    pi.SetValue(t, Convert.ToString(value), null);
                                }
                            }
                            else if (pi.PropertyType.Name.ToLower() == "lookupmodel")
                            {
                                if (dt.Columns.Contains(string.Concat(tempName, "Name")))
                                {
                                    object valuename = dr[string.Concat(tempName, "Name")];
                                    if (valuename != DBNull.Value)
                                    {
                                        LookUpModel lum = new LookUpModel();
                                        lum.id = Convert.ToString(value);
                                        lum.name = Convert.ToString(valuename);
                                        pi.SetValue(t, lum, null);
                                    }
                                    else
                                    {
                                        throw new Exception(string.Format("The value of column ‘{0}‘ is null!", string.Concat(tempName, "Name")));
                                    }
                                }
                                else
                                {
                                    throw new Exception(string.Format("The column ‘{0}‘ dose not exist!", string.Concat(tempName, "Name")));
                                }
                            }

                            else if (pi.PropertyType.Name.ToLower() == "int32" || pi.PropertyType.Name.ToLower() == "nullable`1")
                            {
                                pi.SetValue(t, Convert.ToInt32(value), null);
                            }
                            else if (pi.PropertyType.Name.ToLower() == "decimal")
                            {
                                pi.SetValue(t, Convert.ToDecimal(value), null);
                            }
                            else if (pi.PropertyType.Name.ToLower() == "datetime")
                            {
                                pi.SetValue(t, Convert.ToDateTime(value), null);
                            }
                            else if (pi.PropertyType.Name.ToLower() == "boolean")
                            {
                                pi.SetValue(t, Convert.ToBoolean(value), null);
                            }

                        }
                    }
                    ts.Add(t);
                }
                return ts;
            }
            catch (Exception)
            {
                throw;
            }
        }
    }