dataTable转成对象、json、list

datatable转换成list集合

csharp 复制代码

public static T TableToEntity<T>(DataTable dt, int rowindex = 0, bool isStoreDB = true)
        {
            Type type = typeof(T);
            T entity = Activator.CreateInstance<T>();
            if (dt == null)
            {
                return entity;
            }
            DataRow row = dt.Rows[rowindex];
            PropertyInfo[] pArray = type.GetProperties();
            foreach (PropertyInfo p in pArray)
            {
                if (!dt.Columns.Contains(p.Name) || row[p.Name] == null || row[p.Name] == DBNull.Value)
                {
                    continue;
                }
                if (isStoreDB && p.PropertyType == typeof(DateTime) && Convert.ToDateTime(row[p.Name]) < Convert.ToDateTime("1753-01-02"))
                {
                    continue;
                }
                try
                {
                    var obj = Convert.ChangeType(row[p.Name], p.PropertyType);
                    p.SetValue(entity, obj, null);
                }
                catch (Exception)
                {

                }
            }
            return entity;
        }

//多行datatable数据转换为对象：

csharp 复制代码

 public static List<T> TableToList<T>(DataTable dt)
    {
        List<T> listT = new List<T>();

        Type type = typeof(T);

        if (dt == null)
        {
            return listT;
        }
        if (dt.Rows.Count > 0)
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                T entity = Activator.CreateInstance<T>();

                DataRow row = dt.Rows[i];

                PropertyInfo[] pArray = type.GetProperties();

                foreach (PropertyInfo p in pArray)
                {
                    if (!dt.Columns.Contains(p.Name) || row[p.Name] == null || row[p.Name] == DBNull.Value)
                    {
                        continue;
                    }

                    if (p.PropertyType == typeof(DateTime) && Convert.ToDateTime(row[p.Name]) < Convert.ToDateTime("1753-01-02"))
                    {
                        continue;
                    }
                    try
                    {
                        var obj = Convert.ChangeType(row[p.Name], p.PropertyType);
                        p.SetValue(entity, obj, null);
                    }
                    catch (Exception)
                    {
                        // throw;
                    }
                }
                listT.Add(entity);

            }
        }
        return listT;
    }

datatable转换成json

csharp 复制代码

public static string DataTableToJson(DataTable table)
        {
            var JsonString = new StringBuilder();
            if (table==null)
            {
                return "数据内容为null";
            }
            if (table.Rows.Count > 0 && table!=null)
            {
                JsonString.Append("[");
                for (int i = 0; i < table.Rows.Count; i++)
                {
                    JsonString.Append("{");
                    for (int j = 0; j < table.Columns.Count; j++)
                    {
                        if (j < table.Columns.Count - 1)
                        {
                            JsonString.Append("\"" + table.Columns[j].ColumnName.ToString() + "\":" + "\"" + table.Rows[i][j].ToString() + "\",");
                        }
                        else if (j == table.Columns.Count - 1)
                        {
                            JsonString.Append("\"" + table.Columns[j].ColumnName.ToString() + "\":" + "\"" + table.Rows[i][j].ToString() + "\"");
                        }
                    }
                    if (i == table.Rows.Count - 1)
                    {
                        JsonString.Append("}");
                    }
                    else
                    {
                        JsonString.Append("},");
                    }
                }
                JsonString.Append("]");
            }
            return JsonString.ToString();
        }