C# 执行搜索填充向量时出错

搜索填充向量

PegaTipo[]

时出现返回错误，错误为：

“System.NullReferenceException”：对象引用未设置为 对象的实例”

类是

Pegatipo[]

返回向量：

    public PegaTipo[] buscaFunc(string func, int ID_empresa)
    {
        SqlDataReader objReader;
        SqlCommand objcmd = null;
        PegaTipo[] retornaInfo = null;
        ArrayList arr = new ArrayList();
        int t;

        vsql = "SELECT [NOME], [CPFCNPJ], [HIDE] FROM CLIENTE WHERE TIPO = @TIPO and ID_EMPRESA = @ID_EMPRESA";

        if (this.Conectar())
        {
            try
            {

                objcmd = new SqlCommand(vsql, objCon);

                objcmd.Parameters.Add(new SqlParameter("@TIPO", func));
                objcmd.Parameters.Add(new SqlParameter("@ID_EMPRESA", ID_empresa));

                objReader = objcmd.ExecuteReader();

                while (objReader.Read())
                {
                    arr.Add(objReader.GetString(0));
                    arr.Add(objReader.GetString(1));
                    arr.Add(objReader.GetBoolean(2));
                }

                t = arr.Count / 3;

                int j = 1;

                retornaInfo = new PegaTipo[t];


                for (int i = 0; i < t; i++, j++)
                {
                    retornaInfo[i].nome = Convert.ToString(arr[0 * j]);
                    retornaInfo[i].tipo = Convert.ToString(arr[1 * j]);
                    retornaInfo[i].hide = Convert.ToBoolean(arr[2 * j]);
                }

                return retornaInfo;
            }
            catch
            {
                throw;
            }
            finally
            {
                this.Desconectar();
            }
        }

        return retornaInfo;
    }

---

您正在初始化PegaTipo数组，但没有在数组中创建PegaTipo实例，因此以下语句：

retronainfo[i].nome=Convert.ToString（arr[0*j]）

正在引发您的异常，因为RetronaInfo[i]为null。您应该在循环中执行此操作：

for (int i = 0; i < t; i++, j++)
{
    retornaInfo[i] = new PegaTipo();
    retornaInfo[i].nome = Convert.ToString(arr[0 * j]);
    retornaInfo[i].tipo = Convert.ToString(arr[1 * j]);
    retornaInfo[i].hide = Convert.ToBoolean(arr[2 * j]);
}

for（int i=0；i

for (int i = 0; i < t; i++, j++)
{
    retornaInfo[i] = new PegaTipo();
    retornaInfo[i].nome = Convert.ToString(arr[0 * j]);
    retornaInfo[i].tipo = Convert.ToString(arr[1 * j]);
    retornaInfo[i].hide = Convert.ToBoolean(arr[2 * j]);
}