reading ColumnAttribute data

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  • lausivcid
    #1

    reading ColumnAttribute data

    Hi,

    How can ColumnAttribute data be read from xxDataClasses.c s Columns
    like this?

    [Column(Storage= "_Name", DbType="VarChar (256) NOT
    NULL", CanBeNull=false )]
    public string Name
    {
    get
    {
    return this._Name;
    }
    set
    {
    if ((this._Name != value))
    {
    this.OnNameChan ging(value);
    this.SendProper tyChanging();
    this._Name = value;
    this.SendProper tyChanged("Name ");
    this.OnNameChan ged();
    }
    }
    }


    Attribute.GetCu stomAttribute(t his.Name.GetTyp e().Module,type of(System.Data. Linq.Mapping.Co lumnAttribute))
    returned null,
    Attribute.GetCu stomAttributes( this.Name.GetTy pe().Module) returned
    only the System.Security .UnverifiableCo deAttribute attribute.
    Specifically I want to parse DbType to get the maximum length of the
    column. Is there any other way to find the column width?

    Thanks,
    lausivcid
    Tags: None
    • Nicholas Paldino [.NET/C# MVP]
      #2
      Re: reading ColumnAttribute data

      lausivcid,

      Well, you have applied the attribute to a property, so you have to get
      the PropertyInfo for that property (Name) and then call GetCustomAttrib utes
      on that.


      --
      - Nicholas Paldino [.NET/C# MVP]
      - mvp@spam.guard. caspershouse.co m

      "lausivcid" wrote in message
      news:ucuih31ivh cp1qpa4jo5bd6gf ofis1jn5m@4ax.c om...
      Hi,
      >
      How can ColumnAttribute data be read from xxDataClasses.c s Columns
      like this?
      >
      [Column(Storage= "_Name", DbType="VarChar (256) NOT
      NULL", CanBeNull=false )]
      public string Name
      {
      get
      {
      return this._Name;
      }
      set
      {
      if ((this._Name != value))
      {
      this.OnNameChan ging(value);
      this.SendProper tyChanging();
      this._Name = value;
      this.SendProper tyChanged("Name ");
      this.OnNameChan ged();
      }
      }
      }
      >
      >
      Attribute.GetCu stomAttribute(t his.Name.GetTyp e().Module,type of(System.Data. Linq.Mapping.Co lumnAttribute))
      returned null,
      Attribute.GetCu stomAttributes( this.Name.GetTy pe().Module) returned
      only the System.Security .UnverifiableCo deAttribute attribute.
      Specifically I want to parse DbType to get the maximum length of the
      column. Is there any other way to find the column width?
      >
      Thanks,
      lausivcid

        Comment

        • lausivcid
          #3
          Re: reading ColumnAttribute data

          Thanks! For

          [Column(Storage= "_Name", DbType="VarChar (256) NOT
          NULL", CanBeNull=false )]
          public string Name
          {
          get
          {
          return this._Name;
          }
          set
          {
          if ((this._Name != value))
          {
          this.OnNameChan ging(value);
          this.SendProper tyChanging();
          this._Name = value;
          this.SendProper tyChanged("Name ");
          this.OnNameChan ged();
          }
          }
          }

          The class tyoe for this property is "job". The below code gets the
          DbType string I am looking for.

          foreach (MemberInfo mi in
          job.GetType().G etMembers())
          {
          string attrib=
          ((System.Data.L inq.Mapping.Col umnAttribute)(m i.GetCustomAttr ibutes(false)[0])).DbType;
          }


          On Sat, 20 Oct 2007 13:02:56 -0400, "Nicholas Paldino [.NET/C# MVP]"
          <mvp@spam.guard .caspershouse.c omwrote:
          >lausivcid,
          >
          Well, you have applied the attribute to a property, so you have to get
          >the PropertyInfo for that property (Name) and then call GetCustomAttrib utes
          >on that.

            Comment

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